I love how everyone just blindly reads the title, and the caption in this video (which was written by a third party, reposting the original they found; and not actually someone there); both by random people, and just assume it's real.
Let's go over the facts of what you can actually see here:
Party going on.
2 women smoking, drinking, laughing, yelling, filming the officer.
Officer sitting there with a pen in his hand obviously writing something.
So you can listen to the random title, which is made up...or my made up idea that he was probably called to a party for a noise complaint, walked in, asked who's house it was, and is there taking a report.
Both aren't facts, because all the know is what he see in the video...but given that he doesn't smoke or drink, and again, only has a pen in his hand; I think my explanation is more likely.