Muted Vimeo does not autoplay background video on desktop. I don't know what's up with this. People have raised this issue before yet no one has offered a solution.
If Joomshaper does not intend to fix this problem, perhaps the background Vimeo play option should be removed? That would solve the frustration on waiting for a fix for months and months and never knowing if it will ever get fixed.
There is a solution: use Youtube or stream from your own server.