I need help!!! effect help....

Question

I want to do an effect on final cut studio where you may have seen in some films where 1 man in the middle is walking normal pace and the people around are walking fast around him....does anyone have any idea? be very helpful please

Answer 1

The short answer is:
There is way too much involved in this effect than can be achieved using Final Cut Pro alone. Since this is a FCP forum, you won't get definitive answer.
The long answer is:
Look at the answers you have already received, and pick the one that you think you can realistically do. Personally, I like the teaching your actor to walk really slow. But you'll have to find a person who has incredible physical control. Film that person walking normally with the camera overcranked. (Don't use FCP slow-mo, it won't look the same. You need the fluidity of overcranking for this.) Then, play back the footage for the actor at regular speed. The actor will have to practice making his slow walk look just like the slow-mo footage. Then, shoot the final product with undercranking, have the actor walk properly slow, and play back at normal speed.
In time lapse photography, if you want to get the streaking of car lights with a person standing in perfect focus, that person has to be able to stand PERFECTLY still for the duration of the exposure. The idea is similar, in respect to the amount of body control your subject must possess.
You could also do this with incredible rotoscoping skills, but that would take infinitely longer, I think. I strongly discourage using a green screen effect unless you are very good with green screen effects. I guarantee, if you don't do incredibly accurate math and measurements, regarding how far the camera is from your subject, what the focal point is, where the focus is on your long shot, making sure your studio setting is perfectly matched for the lighting of your exterior shot, if there is any movement with the camera it has to be EXACTLY the same in speed and distance traveled... you get the idea...
There is a reason it costs millions of dollars to have good special effects. It's hard.