It would appear that the video is from Brazil, but I will need confirmation from someone speaking the language to be sure.
The video shows a blooded man on the road as a presumably mentally ill dude stabs him with a knife in the chest and abdominal areas. The whole thing takes place in a public place, with members of the public around, but none willing to intervene.
The stabbing dude remains calm and collected the whole time. The victim doesn’t react to new stabs and may already be dead. The police are nowhere to be found. Assuming this is Brazil, they are probably busy being manginas someplace.
Props to Best Gore member @carnage-2 for the video: