Background Video only showing in preview

Hi! I am new to WF so I might be doing something wrong. I want to use the background video component. I uploaded the video (11mb) and it shows well in the small preview window inside the background video settings, but it is not showing on the main page. It just shows a black box.

Any ideas how can I solve this issue?
Any tip will be appreciated!

Thanks a lot!

Well, it seems it’s time to take a nap. I found the error, the video was under a dark div and that made me think that the video did not work … sorry.