Who uses an HD camera at 3 frames per second?
The video is looks to be from a series of still frames taken in "burst" mode -- or possibly from a time lapse -- which depending on the camera might only be 4 to 5 fps max.
So we can't discount its authenticity solely on the basis of fps or the fact that it looks a little strange. Someone will have the original full resolution frames for the CAA to investigate.