The vid was a set up. All were actors and the "victim" knew everything. It was a demo to show you that the crime can happen, not to show you how it hppens. There are ways to learn the skill but you have to find them yourself.
Actually that was not the case. This was a clip from the TV show The Real Hustle which airs on BBCOne (there was an American version with Apollo Robbins on TruTV for a bit as well) It is a hidden camera show where people are legitimately conned out of their money or have things stolen from them. Afterwards they are interview by the crew. R. Paul Wilson is one of the main members of the show.
However that being said, the was more of a way to show how one may be pickpocketed, not how to pick someones pockets. I recommend you check out Chappy Brazil's DVD on the watch steal to get you started.