That seems about right... It looks like it travels roughly a meter or so between frames, and the GoPro was likely recording at 60fps, so it was traveling somewh

That seems about right... It looks like it travels roughly a meter or so between frames, and the GoPro was likely recording at 60fps, so it was traveling somewhere around 60m/s relative to the parachutist. So add another 10 m/s for rate of descent of the camera and you come up with 252 km/h.