While I don’t have background information about this video, the flag with “all jews” in the middle suggests that it’s either ISIS, Al-Nusra or other Israel friendly group of mercenaries that released it.
The video shows the public execution of a man with a gunshot to the back of his head. Strangely, during the interrogation, the face of the condemned is pixelated, although during the actual execution it is not. It doesn’t make any sense, but it is what it is.
Props to Best Gore member Refuse2Renig for the video: