I have the backstory : the guys on the video wanted to go in a party they weren't invited in. Police came to make them leaving, they threw projectiles on the policemen and policewomen and violently beaten them. I wouldn't be opposed that the police could shoot in case of those coward agressions.
After saving three children, some Policemen had some rocks thrown on them in a "diversity" district. Source in french : http://www.europe1.fr/faits-divers/...-des-enfants-dun-incendie-3534968#xtor=CS1-16