Override the default WordPress oEmbed for YouTube Videos to always use the myCRED Video Shortcode.

WP YouTube Video EMbed Override

/**
 * Override WP oEmbed
 * @version 1.0
 */
add_filter( 'embed_oembed_html', 'mycred_override_video_shortcode', 999, 4 );
function mycred_override_video_shortcode( $original, $url, $attr, $post_ID ) {
	// If myCRED is not enabled
	if ( ! function_exists( 'mycred_render_shortcode_video' ) ) return $original;

	// Get cache
	$cachekey = '_mycred_' . md5( $url . serialize( $attr ) );
	$cache = get_post_meta( $post_ID, $cachekey, true );

	// If cache is set, return it now
	if ( $cache !== '{{unknown}}' && ! empty( $cache ) )
		return $cache;

	// If video id is not set
	if ( ! isset( $attr['id'] ) || empty( $attr['id'] ) ) {
		$video_id = '';
		if ( preg_match( '%(?:youtube(?:-nocookie)?\.com/(?:[^/]+/.+/|(?:v|e(?:mbed)?)/|.*[?&]v=)|youtu\.be/)([^"&?/ ]{11})%i', $url, $matches ) && isset( $matches[1] ) && ! empty( $matches[1] ) ) {
			$video_id = $matches[1];
		}

		$attr['id'] = $video_id;
	}

	// Return original embed if video id is not found
	if ( $attr['id'] == '' ) return $original;

	// Run the myCRED Video Shortcode
	$html = mycred_render_shortcode_video( $attr );

	// Cache results
	update_post_meta( $post_ID, $cachekey, $html );
	
	return $html;
}

/**
 * Delete Video Cache
 * @version 1.0
 */
add_action( 'pre_post_update', 'mycred_delete_oembed_caches' );
function mycred_delete_oembed_caches( $post_ID ) {
	$post_metas = get_post_custom_keys( $post_ID );
	if ( empty( $post_metas ) )
		return;

	foreach( $post_metas as $post_meta_key ) {
		if ( '_mycred_' == substr( $post_meta_key, 0, 8 ) )
			delete_post_meta( $post_ID, $post_meta_key );
	}
}