Hello.
I want to insert a video as a background but when I open the site the video does not start automatically.

on the placeholder I have:
<video class = "xar_meplayer" src = "index_htm_files / Communication - 19498.mp4" controls autoplay width = "100%" height = "100%" />

This is the link of the test site: https://opencreative.it/

The 2 videos on chrome do not start
1 of 2 videos on firefox start up

Where am I doing wrong?
What is the exact procedure to insert a video as a background without problems?
Should I use a gif file?