We are told in the video description that a hunter in Mississippi captured the video footage. While remaining silent, he videoed the creature pulling bark from a large tree stump and presumably eating the grubs found inside.
The video itself is quite clear and whoever shot it clearly had nerves of steel. However, those nerves finally gave out when the creature stood up.
As with all photographs and video in the digital domain, it is hard to authenticate due to the ease of editing, but whatever the creature was, the context of this video does look genuine.