Both the police and the reporters were calm and polite. The police told them they had to clear the street and instead of obeying the order they asked to let them know when they were going to actually walk down the street. Since they refused to obey the order they were detained and escorted out of the way.
Being a reporter does not give you a free pass to disobey orders, specially during situations like that. Being a police offer also does not give you the right to mistreat people of course, but in this video everyone actually behaved very well.
It would be great if the police could figure out how to serve the public in a way where they could be proud of their work and want the journalists to help the world see the good work they're doing.
There was a big protest and people started throwing rocks at the police, and the media were in the middle of the police at that moment. It actually made the police's response much slower and dangerous because they first protected the media and escorted them out from the protesters range, before charging and arresting people.
I'm sure they have trained some protocol to how to control mobs, and throwing innocent civilians in the mix wrecks the whole thing.