Enlarge screen on iPhone X/iPad Pro 12.9

Hi guys and thank in advance for your help. Is there a way to enlarge screen on the iPad (Pro 12.9) and iPhone (XS max). I.e when you watch a video you double tap to make it fill the screen (even though some of the feed may be cut off at the sides).
I hope that makes sense.
Thanks, Matt

The video stays in it's native 16x9 aspect. There's no way to zoom it and crop it to use the full screens.

Ok, thank you for the quick reply. Can I offer this as a feature request for the future?
Thanks, Matt