[video_lightbox_youtube video_id=vkmGBbY3itQ&autoplay=1 width=640 height=480 anchor=http://www.mobilecarpetcleaningsites.com/stanleysteemer/wp-content/uploads/2013/01/DemoVideoThumbnail.jpg]

Change the video_id to =YOUTUBE ID (Find this in the url of the Youtube video you want to embed)

Change the anchor url to the pic you want them to click on.