displaying featured image url of custom post type in image tag

You can use get_the_post_thumbnail($post, $size, $attrs)/the_post_thumbnail($post, $size, $attrs) for print image full taq or get_the_post_thumbnail_url($post, $size, $attrs) if you want return just featured image url.

Also you can use wp_get_attachment_image($attachment_id, $size, $atts) or wp_get_attachment_image_url($attachment_id, $size, $atts) for not featured images but from your media library.