Okay so I only have iMovie at th moment and have no way to upgrade at the moment. Well I want to compose a scene were lots of people are running up and down the hallways while 2 other people are walking the other way. The thing is that I want the group of people to move really fast, while the people in the middle are walking normally. I was thinking that I would film 2 exact scenes and then just place one scene over another, is that possible? Or do I need to do something else?