I did it several times for one of our clients, but I used the original repo, not the forked on. Before trying to set it up, I’d suggest updating the forked master branch.
Also, are you sure any of our clients are using this repo? As far as I remember correctly, I was the one who forked the repo to be able to contribute upstream. If none of the clients are using the forked version, couldn’t we just drop it?
Anyways, could you please help with a bit more details? Do you have any console messages about why you cannot see the video? Is the expected HTML there? What was the Video URL you used? How did you configure the XBlock? Can you see the video in Studio at least? etc