Different custom header image on different page

create new file in your theme with name header-custom.php
next copy this code into that file

    class customheaderMetabox {
    private $screen = array(
        'post',
        'page',
    );
    private $meta_fields = array(
        array(
            'label' => 'Add Image Header',
            'id' => 'addimageheader_24744',
            'type' => 'media',
        ),
    );
    public function __construct() {
        add_action( 'add_meta_boxes', array( $this, 'add_meta_boxes' ) );
        add_action( 'admin_footer', array( $this, 'media_fields' ) );
        add_action( 'save_post', array( $this, 'save_fields' ) );
    }
    public function add_meta_boxes() {
        foreach ( $this->screen as $single_screen ) {
            add_meta_box(
                'customheader',
                __( 'Custom Header', 'textdomain' ),
                array( $this, 'meta_box_callback' ),
                $single_screen,
                'advanced',
                'default'
            );
        }
    }
    public function meta_box_callback( $post ) {
        wp_nonce_field( 'customheader_data', 'customheader_nonce' );
        echo 'Allow you to add custom header in every page';
        $this->field_generator( $post );
    }
    public function media_fields() {
        ?><script>
            jQuery(document).ready(function($){
                if ( typeof wp.media !== 'undefined' ) {
                    var _custom_media = true,
                    _orig_send_attachment = wp.media.editor.send.attachment;
                    $('.customheader-media').click(function(e) {
                        var send_attachment_bkp = wp.media.editor.send.attachment;
                        var button = $(this);
                        var id = button.attr('id').replace('_button', '');
                        _custom_media = true;
                            wp.media.editor.send.attachment = function(props, attachment){
                            if ( _custom_media ) {
                                $('input#'+id).val(attachment.url);
                            } else {
                                return _orig_send_attachment.apply( this, [props, attachment] );
                            };
                        }
                        wp.media.editor.open(button);
                        return false;
                    });
                    $('.add_media').on('click', function(){
                        _custom_media = false;
                    });
                }
            });
        </script><?php
    }
    public function field_generator( $post ) {
        $output="";
        foreach ( $this->meta_fields as $meta_field ) {
            $label="<label for="" . $meta_field['id'] . '">' . $meta_field['label'] . '</label>';
            $meta_value = get_post_meta( $post->ID, $meta_field['id'], true );
            if ( empty( $meta_value ) ) {
                $meta_value = $meta_field['default']; }
            switch ( $meta_field['type'] ) {
                case 'media':
                    $input = sprintf(
                        '<input style="width: 80%%" id="%s" name="%s" type="text" value="%s"> <input style="width: 19%%" class="button customheader-media" id="%s_button" name="%s_button" type="button" value="Upload" />',
                        $meta_field['id'],
                        $meta_field['id'],
                        $meta_value,
                        $meta_field['id'],
                        $meta_field['id']
                    );
                    break;
                default:
                    $input = sprintf(
                        '<input %s id="%s" name="%s" type="%s" value="%s">',
                        $meta_field['type'] !== 'color' ? 'style="width: 100%"' : '',
                        $meta_field['id'],
                        $meta_field['id'],
                        $meta_field['type'],
                        $meta_value
                    );
            }
            $output .= $this->format_rows( $label, $input );
        }
        echo '<table class="form-table"><tbody>' . $output . '</tbody></table>';
    }
    public function format_rows( $label, $input ) {
        return '<tr><th>'.$label.'</th><td>'.$input.'</td></tr>';
    }
    public function save_fields( $post_id ) {
        if ( ! isset( $_POST['customheader_nonce'] ) )
            return $post_id;
        $nonce = $_POST['customheader_nonce'];
        if ( !wp_verify_nonce( $nonce, 'customheader_data' ) )
            return $post_id;
        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
            return $post_id;
        foreach ( $this->meta_fields as $meta_field ) {
            if ( isset( $_POST[ $meta_field['id'] ] ) ) {
                switch ( $meta_field['type'] ) {
                    case 'email':
                        $_POST[ $meta_field['id'] ] = sanitize_email( $_POST[ $meta_field['id'] ] );
                        break;
                    case 'text':
                        $_POST[ $meta_field['id'] ] = sanitize_text_field( $_POST[ $meta_field['id'] ] );
                        break;
                }
                update_post_meta( $post_id, $meta_field['id'], $_POST[ $meta_field['id'] ] );
            } else if ( $meta_field['type'] === 'checkbox' ) {
                update_post_meta( $post_id, $meta_field['id'], '0' );
            }
        }
    }
}
if (class_exists('customheaderMetabox')) {
    new customheaderMetabox;
};

next include file in function.php
using this code include(get_template_directory().'/header-custom.php');

after this step you will see new metabox in post and page on wp admin.

next if you want to show that image put this code in your header.php or in page.php <img src="https://wordpress.stackexchange.com/questions/170868/<?php echo get_post_meta( $post->ID,"addimageheader_24744' , true);?>">