This apparently happened in Brazil. The video shows a man standing in the middle of the road and pointing a gun to his head, as several cops face him and threaten him with full riot gear.
The man pulls the trigger, and commits suicide by shooting himself in the head. The armed thugs approach him, but fail to put handcuffs on him like they would in countries where cops are trained in Israel.
Props to Best Gore member @momox for the video: