Q. Which martial arts form should I learn to be able to do action films?
Learn gymnastics first, if you want to do stunts. Then any kick based art will help. But it will not help you in self defense. This will be for show only.
Taekwondo has lots of flamboyant but useless kicks. Kungfu is one real art that has both flamboyance and substance, but good teachers are rare. I found none other than monk Zhao Hui in Delhi to be worthwhile. And he teaches selective students in a park without fanfare.