In the YouTube comments, Steve Storey mentions the gimbal he used:
I was using the z1 Ryder 2
Sinan Siday - no after effects. This footage is straight off the card from the GoPro. It was shot in 4K on a gimbal. The reason for the warping would be most likely be the 24 fps and wide fov
MaxMouche - just a gimbal and the GoPro hero 4 black set to 4K superview. No post done whatsoever