I have not seen this myself, but a colleague talked about it and I got curious.
The intro has a boy visiting Eastern Europe with his father and is bitten by a werewolf while waiting outside when his father is visiting a brothel. Presumably they are both from the US, but they may be from England also?
Later in the movie there is a scene with bullets flying where the movie goes black because the cameraman is shot.
I assume that the shot cameraman is sufficiently unique to identify the movie. If not I will try to get more details.