This video is from Syria, but the injury doesn’t look consistent with a gunshot wound, though I may be wrong. It looks more like something fell on the boy’s head, or maybe the boy fell on his head? Either way, whatever caused it, it cracked the boy’s skull, but didn’t kill him. Fellow FSA mercenaries immediately took advantage of him and exposed his wound for a propaganda video, enticing the boy to feeling how bad it really was.
It is possible that the boy was a mercenary himself. There are videos of kids reciting that bullshit Islamic war talk like they really understand what they’re being tricked into. Human Rights Watch also released reports of FSA using child soldiers for all sorts of tasks, including as human shields and once shot, as subjects for whine videos.