The video is not fake and made ​​headlines in major newspapers in Brazil.
This video shows two girls who died in the river Itajubá apparently attacked by a giant snake (Anaconda?). The snake appears before the attack on the riverbank when a boy dragging a tree trunk. At the moment of attack the snake's head appears behind the girl. There is now an intense debate in Brazil is that what emerges is a snake or an unknown animal.