The shot you pointed out is mostly just showing off. (a bank-and-kiss shot -- kiss the 8 back into the pocket) It's very rare that it would be the best shot. In my experience, the particular shot shown is not possible on most equipment because you can't get the object ball to go back that far.
Here's a video of a similar shot that's easier to make along with some explanation of how it's done.
https://www.youtube.com/watch?v=2enopvFnTno
If you play one pocket, you might have a situation where it's the best shot. It might come up once every five or six years if you play all the time. It will take you about 15-30 minutes of practice to get a good feel for the shot if you want to make it yours.