Sorry it does seem like a contradiction. Can I try one more time to explain?
The effect I want to achieve is a blank/black screen with a rectangular window on the right hand side containing video of a performer which is taken from a larger shot but is focussed in on the individual as they move around.
I can then repeat this on the left hand side with a different performer, to this I add names underneath. The overall effect is individual shots of performers for the credits.
Apologise if that still sounds confusing, if so I’ll stop wasting your time.
Thanks