Escape From Camp 14 is definitely worth a watch.
Camp 14: Total Control Zone, is the name of the documentary, if that is what you are referring to.
I just finished watching it, and it was good. It was a compelling story, and an incredible one at that. Just amazing what human beings are capable of doing to one another. If you have even the slightest interest in North Korea, you should watch it.
Some negatives on the documentary though, it can be a bit slow moving. At times, they don't translate some of the stuff they talk about. Overall though, I thought it was well done.
I will probably read the book soon, since I keep reading that it is better than the film.