// You can add custom params for any "vendor" this example is for youtube
add_filter( 'wpex_get_video_embed_url_params', function() {
return array(
'youtube' => array(
'autoplay' => 1
),
);
} );
Snippets: Add Custom Params to Lightbox Videos
All PHP snippets should be added via a child theme's functions.php file or via the Code Snippets Plugin (or alternative plugin)