I've been using the Jumpstart theme with a video that plays (when the play button is clicked) for a few years with no issues.
PROBLEM: I just uploaded a new video to YouTube and went to change the link in my theme and it won't play, just goes to a black screen. I even changed it back to the original video link and it still goes black and no video plays???
You have added YouTube link is not loading so try to add this link
ok try to ad this link: