Hey, I hate to say it is fake and I really believe that these kind of incidents happen regularly in Iran but I really think this particular video is fake,

First, the police uniform is available to purchase for public. (If you don't believe me just head down to south) So anybody can buy a full set of uniform for about 20 bucks

Second, No one is stupid enough to allow anybody to film them doing these sort of things

and last, Listen to the audio, how come there conversations isn't recorded, and the music, just listen to it for Gods sake, I mean I'm not expecting to hear Arash or Mansour playing but the music is just too much