I look at you video and saw that you could not format you SD card. Did you insure your SD card is properly seated? I had a similar issue and needed to use special care to insure the card was fully seated. I actually needed to use a pair of tweezers.
Please try this link - I was able to find the instructions for the "Cheerwing" Gimbal I purchased through Amazon
http://docs.askives.com/gopro-gimbal-camera-mount.html