This is Coast Guard surveillance video. After approximately 2 minutes of a fairly static scene, you can see a splash line to the left. The video zooms in and you can see the passengers exiting.
For me the most amazing thing is that the picture very quickly pans right to capture the first commercial ferry steaming to the plane. It reaches the plane about FOUR minutes after it ditches. Two others join the fray and in less than 10 minutes, people are being rescued.
Hollywood could not write this scene any better.