If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
I think I don’t understand the question right. Can you give me more details please. The lightbox itself can’t show thumbnails and a youtube video (have a look at this page for more details: http://www.no-margin-for-errors.com/projects/prettyphoto-jquery-lightbox-clone/ – go to demo section > youtube content)
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