I need help in figuring out if someone is hacking. Can you guys help me?

I'm trying to figure out if the player in this video is using hacks. He has been a nuisance to the server since he joined, and about three or four people have said that he is hacking. I took this video while my clan was in a firefight with him. Is it possible that he is hacking in this video? I'm not trying to hackusate or attack him, but none of my friends can explain this video with anything other than shear luck.

https://www.youtube.com/watch?v=HomuqIOza5A&feature=youtu.be