Responsive images are in WordPress core since 4.4
https://make.wordpress.org/core/2015/11/10/responsive-images-in-wordpress-4-4/
srcset and sizes are used to accomplish this.
If your theme doesn’t implement these properly you will have to modify theme files.
<?php
// Specifying width of 400 (px) and height of 200 (px).
$srcset = wp_get_attachment_image_srcset( get_custom_header()->attachment_id, array( 400, 200 ) );
?>
<img src="https://wordpress.stackexchange.com/questions/318150/<?php header_image(); ?>" srcset="https://wordpress.stackexchange.com/<?php echo esc_attr( $srcset ); ?>">
https://developer.wordpress.org/reference/functions/wp_get_attachment_image_srcset/
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