This is a leaked video from Blackwater in Iraq. It's some horrifying shit - they're just driving into town running over people and shooting random people for fun. Obviously the content is shocking, so careful if you're not ready to watch this. Also, imagine the shit they did that wasn't filmed/leaked.
the playful transition effects are, uh
Between this and the music, I suspect that video was filmed and edited by the war criminals it depicts themselves.