German director Marc Wiese has made a film, Camp 14: Total Control Zone, based on Blaine Harden’s book Escape from Camp 14. It features interviews with Shin Dong-huyk, the man born inside the North Korean prison camp who eventually escaped to the West, and with a former camp guard and an ex-secret policeman. Life inside the camp is portrayed through animated sequences by Ali Soozandeh.
Here's the trailer from the Toronto Film Festival:
There's a good review here.
The other North Korean film shown at the festival, "Comrade Kim Goes Flying", I've already commented on.