Britain got talent

The other day  in english we make a project about britain got talent and I chose these video:
The video is about a group of eight people that perform a lots of tricks,these group is called AMERICAN STUNT TEAM. The group was in the quarter final in 2012. Some people are with bmx but other are with skates. What they do is quite dangerous and they have to do it carefully.
I chose this group becouse I think that they make amazing tricks and they are peopple with a lot of talent, I´d like to know how to do this. Here is it!!!
https://www.youtube.com/watch?v=SOS5f9RU7qM