When you are of the kind of people who also like a distortion-free screen, you may also dislike that the macOS cursor sometimes shows up in fullscreen video playback.
Fortunately there is a very simple solution:
just press the F8 key on your keyboard while in fullscreen (e.g. video playback)
– and it will be gone!
Remember: depending on your primary use for the F(unction)-keys, you may need to hold the fn+F8 keys to achieve the same result.
Haven’t tested this yet on a MacBook Pro with the digital TouchBar – feedback about that is very welcome.