1:40 to 1:54
When he was brought onto the police vehicle (he had already lost his glasses and one running shoe), he was punched and kicked. He slid to the floor of the vehicle, and the police used their feet to stomp on his head. The boy still feels a bit of pain.
Below is a new link. It is now an extended video with the boy's face & voice disguised, with a translation hitting the main points (not a full translation).
My additional translation now starts at 1:45 instead of 1:40.
3:25 - By this point, he was crying really hard. (after he fell to his knees)
3:36 - Police threatened to hit his private parts.