When viewing videos on the iPhone or iPad in full-screen mode, you might be used to tapping the screen and then tapping the Done or Back button at the top left in order to quit them
What you should do is simply use the pinch-to-shrink gesture anywhere on the screen:
The video will then disappear.
This works when viewing videos pretty much anywhere – those you’ve recorded yourself, or that you’re watching online.
In apps like YouTube you can use the reverse gesture – pinch-to-expand – in order to start videos playing fullscreen if they aren’t already.
Give it a try!