This is not working. First, there is already a type video, so you can't just save it as suggested above. The video BB code has a lot of options for different providers, such as hulu, youtube, google etc. It seems the best way to do this is to edit that template and modify the services that can handle HTML5 as suggested here:
https://vborg.vbsupport.ru/showthread.php?t=261336
I tested with youtube and get just a blank white screen.