removing the featured product image, and replacing it with a featured video, this code uses ACF (configured upload field for product post type, to return the URL of the upload)

woo-featured-product-video.php

// just place this code to the functions.php file of your active theme (child or parent)
add_filter( 'woocommerce_single_product_image_html', 'remove_featured_image', 10, 3 );

function remove_featured_image( $html, $attachment_id, $post_id ) {
    // this is a ACF upload field, configured to return the upload URL (location) and assigned to product post type
    // `upload_product_video` is the slug of the ACF field
    $product_video_url = get_field( 'upload_product_video', $post_id );
    
    // we replace the original featured image of the product, with a video
    if ( '' != $product_video_url ) {
        return '<style>video#product-video { display: block; width: 100%; height: auto; box-shadow: none; }</style><video id="product-video" width="375" height="375" controls><source src="' . $product_video_url . '" type="video/mp4"><source src="' . $product_video_url . '" type="video/ogg">Your browser does not support HTML5 video.</video>';
    } else {
        return $html;
    }
}