How to get background video to auto play on page?

Site URL: https://www.sensebellum.com/

I really would like to get a video to auto play on my home page.

I don't want a cover page.

I want to have a page in my index that has a full bleed video auto play.

I have no idea why it won't work so I am reaching out for help.

I tried pasting the video into the page. I just get a black screen... It even works on a similar website I have but not this one! Any tips? Any more info I can provide?

Right now I have a gallery play on the home page. I would like to replace that with a video that plays automatically. Once again, not a cover page, not an embedded "must-click-to-play" kind of thing. But a large auto play video. These have been hot since 2014. Please tell me there is a way.

Here is the video: 

In addition I loaded a "fallback image" and that also did not appear so I do not think there is an issue with the video not being good for viewing, etc.

Looks like it was maybe a transparency issue!