on the weekend me and my friends were dancing to gangnam style and i was filming and my friend did this hilarious thing during the elevator scene. i was wondering how i would get an elevator to open in the video. to reveil the footage of my friend dancing??
i have tried using a layer and cropping and it just stays the same when i play it back
how do i do it?
i have tried using a layer and cropping and it just stays the same when i play it back

how do i do it?