$('.popup-youtube').magnificPopup({ code example
Example: youtube video magnific popup
$(document).ready(function() {
$('.popup-youtube, .popup-vimeo, .popup-gmaps').magnificPopup({
disableOn: 700,
type: 'iframe',
mainClass: 'mfp-fade',
removalDelay: 160,
preloader: false,
fixedContentPos: false
});
});
<a class="popup-youtube" href="http://www.youtube.com/watch?v=0O2aH4XLbto">Open YouTube video</a>