Please take a look at 1:57, 3:18 and 3:58 in Busta Rhyme's music video: https://www.youtube.com/watch?v=QhIrzbhEGvs

At these particular times, Busta crunches the piece of paper to reveal himself in a new backdrop.

Am I right to say that this was simply done by having green/blue paper? I've never worked with a green/blue screen before so I'm just guessing here!
Anyway, if that is how it's done, does the creases in the paper show up like it has in the video naturally, or was that added in post production to give it more of a paper-look effect. I hope that makes sense!