There's no doubt that the kid who kicked the other in the face should have been ejected and at the very least suspended for a number of matches and possibly for the season. Just by the fact he showed no remorse and made no immediate effort to apologize.
However it's a little hysterical to call for charges, police investigation and so forth. It is no really possible to judge for the video if it was intentional, it could have been but it's not clear cut. What is obvious is his behavior afterwards which is a large part of the problem. Obviously the adults lost it but looking at some of the hysteria here and knowing parents and coaches, it's not surprising. If it was my kid or I was coaching the team, I would have been on the field checking on him first and then asking some questions.