He's done it before hasn't he.

With the trackstand thing, make sure you don't have a balance problem yourself. It won't be major (or you wouldn't be riding) but there are issues that have poor balance as a side effect. In my case, I've always wondered why I struggled to do things other riders did and it really came to a head when I took up bike polo and found I couldn't even lean on the mallet like everyone else. A chat with my doctor answered that one (and yes, I still have the issue).

Generally though, practice will improve everything, there'll just be a point where you won't get much further (few will ever match the bloke in the video).