There are many ways to strap a GoPro on when kiting. You can mount it on your kiteboard, your helmet, your kite strings, or even (*groan*) a selfie stick.
We like the shots we get with our GoPro strapped to the main strut of our kite, near the leading edge and this is the mount I made to do so. I made wide strap out of Crypton Ultrasuede scraps I had aboard from our cushion covers with two strips of 2” velcro. I used some Seam Stick at first so I could take it to the beach and fit it onto a few different size kites to make sure it would work before I sewed it.
Then I took neoprene from an old old laptop case and made a pocket for the GoPro. In the flap on the open side of the pocket, I put a snap in plastic tarp grommet and some kite string (spectra type). The kite string was cut long enough so that one side could be tied to the pump up loop on the kite and the other side to the GoPro in case the case failed.
With the case and camera mounted on the kite, I outlined the lens of the GoPro with chalk, removed the case, and cut out the lens hole.
We accidentally tested the backup string when we crashed the kite so hard that the camera popped out through the lens hole (!!!) and the string kept the GoPro dangling from the kite while we sailed back to the beach and removed it.
And here is what we get with it. Not as flexible as a drone, but dirt cheap, and very satisfying.