handle-youtube-link

/* Get the ID from a youtube link */
function getYoutubeID(url) {
  var id = url.match("[\\?&]v=([^&#]*)");
  id = id[1];
  return id;
};

/* Get an image preview of the video */
var thumb_url = "http://i3.ytimg.com/vi/"+getYoutubeID('MY-YOUTUBE-VIDEO-URL')+"/maxresdefault.jpg";
$('<img id="video-preview" src="'+thumb_url+'" />').prependTo($("div.preview-video"));
/* details about youtube previews there : http://stackoverflow.com/a/2068371/1740412 */

/* Create an iframe to embed the player */
$('<iframe id="youtube-iframe" style="border:0;" src="https://www.youtube.com/embed/'+getYoutubeID('MY-YOUTUBE-VIDEO-URL')+'?autoplay=1&autohide=1&border=0&wmode=opaque&enablejsapi=1" />').prependTo($("div.youtube-embed"));