Well, reports say TMZ broke the video so that makes it pretty easy:
The "brutal footage" is at the top of this link:
http://www.tmz.com/2018/11/30/kc-chiefs-kareem-hunt-attacked-kicked-woman-surveillance-video/
I'll say this much. All parties concerned look pretty drunk and we've seen a lot worse. The "kick" isn't much of anything. It looks like the damage was done when the girl hit her head against the wall with the shove where intent is unclear.
We must add the perfunctory, "there is no excuse". It is a case of stupid people doing stupid things.
And somebody needs to tell Kareem Hunt that renting an "apartment" in a hotel is a stupid way to spend his money.
This will be investigated by the NFL, he'll draw a suspension, profuse appologies will be made, an out of court settlement will be paid, and then he'll land somewhere.