/**
 *
 * Enable YouTube Privacy Enhanced Mode
 *
 */
add_filter( 'streamtube/player/file/setup', function( $setup, $source ){

    if( $setup['sources'][0]['type'] == 'video/youtube' ){
        $setup['youtube']['enablePrivacyEnhancedMode'] = true;
    }

    return $setup;

}, 10, 2 );