Privacy friendly video embeds in WordPress

mu-plugin-dnt-video.php

<?php
// This will make WordPress ALWAYS use privacy friendly embeds, implemented here are YouTube and Vimeo. 
// Other services can be implemented by using this code as inspiration.
add_filter( 'oembed_dataparse', 'myproject_patch_oembed_urls', 11 );
function myproject_patch_oembed_urls( $html ) {
	// find vimeo.com urls and add ?dnt=1 to them.
	$urls = wp_extract_urls( $html );
	foreach ( $urls as $old_url ) {
		if ( false !== strpos( $old_url, 'vimeo.com' ) ) {
			$new_url = add_query_arg( 'dnt', 1, $old_url );
			$html = str_replace( $old_url, $new_url, $html );
		}
		// Embeds of youtu.be (and others) are already translated to youtube.com by WordPress, they all work.
		if ( false !== strpos( $old_url, 'youtube.com' ) ) {
			$old_url_domain = parse_url( $old_url, PHP_URL_HOST );
			// www.youtube-nocookie.com MUST HAVE www. in the domain because the non-www version does not have a valid SSL certificate. #GoGoogle #Facepalm.
			$new_url_domain = 'www.youtube-nocookie.com';
			$new_url        = str_replace( "//$old_url_domain", "//$new_url_domain", $old_url );
			$html           = str_replace( $old_url, $new_url, $html );
		}
	}

	return $html;
}