Has anyone found a way to insert the
Not a video, but animated gifs are supported. The performance will depend a lot on your HASS server hardware and connection though.
The video tag renders the video in the client browser and has nothing to do with the server other than to serve up the file in a timely manner.
This guy has been playing with it: https://discordapp.com/channels/330944238910963714/460846676358332417/498988360346370069
In case anyone stumbles upon this thread go to this post: Lovelace: Weather Mp4 Backgrounds for the solution. 