@mariusjopen, here is an example of the website I am building:
http://andreszardenings.com/nahe-shortfilm/.
In this page the video, is shown with an aspect ratio of 2.35:1, as I said before.
But when I make it fullscreen, somehow the code cuts the right and left sides and we miss most of the details.
I've been trying to fix it for a week now, but no luck with that.