Video Lightbox

thanks – i added this to my functions.php of my child-theme (with the trigger class: extralink):

function modal_video() { 
?>
<script type="text/javascript">
jQuery(window).load(function(){
	jQuery('.extralink').magnificPopup({
	  type:'inline',
	  midClick: true
	});
});
</script>
<?php 
}
add_action('wp_footer', 'modal_video');

that works now

all praise goes to ismael – i only renamed some settings to better recognise the use of that function