Full screen video – Black bar at the top and bottom

Good day,

For the homepage of a client’s website, I would like to have a full-screen video playing. The video displays black strips on the top and bottom.

I have tried the following:
1. Video as the background of a colour section
2. Video as the background in Slider Revolution
3. Video in an easy slider – This is its current state.

Please can you assist?

Kind regards,
Camilla