First off, I don't like how this recording starts halfway into the confrontation; however judging from the circumstances this definitely looks like a clear case of excessive force. The guard was behind a closed/secure gate and there doesn't appear to be any signs of imminent danger or threats to the guard. I believe this youtuber was intentionally trying to provoke this halfwit security guard into shooting him so he can cash in on a massive lawsuit (just speculation though). The guard has been charged by the Los Angeles Police Department for assault.