This is an odd little entry in the found-footage genre. Some film students are filming bear hunters or something, but there's this guy who's a suspected bear poacher. Because killing bears without a license is terrible. The Norwegian government regulates the bear population so only certain people get licenses to hunt them.
The students follow this mysterious guy around, and follow him out into the woods one night. Turns out he's not hunting bears. He's hunting trolls. That's right. Trolls. Trolls are real and the government has somehow managed to keep it a secret. For some reason. There's really no explanation as to why it has to be kept secret. It's just another species of animal after all. I have no idea how they keep it a secret either, since some of them are hundreds of feet tall.
Anyway, it's this guy's job to kill any troll that gets out of territory and the kids follow him around filming and stuff. There's not much more to the plot other than that.
The effects were surprisingly decent. I was expecting the film to look really cheap but it was reasonably professional.
Some parts were really stupid though. The film tried quite hard to explain trolls like any other animal. Like why some of them grow extra heads, why some explose when exposed to daylight and why some turn to stone, etc. But they kept one ridiculous part of troll lore and completely failed to explain it in any way. Somehow, trolls can smell out Christians. If you believe in Jesus, the trolls can smell it. For no reason.