Hello, your answer is rather ambiguous.
Could you confirm that no matter what a developer does, it is not possible to visualize a YouTube video on a mobile device ?
When you say that you have to edit the line
background:url('http://placehold.it/1280x720');
you are simply meaning that you have to insert there the name of an IMAGE ? Is that right ?
If that is true this is a huge limitation. It should be possible to link, at least, the You Tube video and redirect the user to the YouTube video page. Is there a way to do it ?