This is a video of Ethiopian Airline Boeing 737 Max 8, that crashed on Sunday. It was taken from a camera in the cockpit shortly before the plane crashed.
Earlier, a video not connected to this incident was circulated online. It didn’t take time for people to know it was fake. Here is the original video documenting last moments of the crash. It clearly looks like it was from a camera in the plane’s cockpit.
The video shows the moment the airplane’s engine went off and it started heading to the ground. People could be heard screaming. The video was merged with clips of the aftermath of the disaster when the plane went up in flames after the crash. That was probably taken by someone else on the ground who arrived the scene immediately after the disaster. So two videos were combined in this single clip.