I don’t know anything about this video, but it appears to be from the Middle East – perhaps Syria or Iraq. It shows a small group of soldiers on a remote dirt road observing an unexploded ordinance. Then out of the blue, an explosion occurs near by.
Once they recovered from the surprise, they walked a short distance where there were two corpses of men killed by the explosion. One of the men was decapitated by it, but the head is nowhere to be seen. Maybe the explosion blew it up?