A:AnswerI would think you could use it for YouTube videos. It seems that it will work with any tripod. Mine is very cheap and it works perfectly with this gimbal.
I use my iPhone XR and I personally think it would work better with a smaller phone.
A:AnswerAt its smallest, this can clamp a 2.25" phone. I don't know the dimensions of the gopro but it may work as long as the gorpro is taller than that. The only other problem you may have is since this is made for a phone its not very deep so I don't know how well it would hold the GoPro. Good luck.
A:AnswerI used this while snowboarding at Breckenridge. The video came out very stable at varying speeds. I have been very happy with it so far. They have a 30 Day return policy so maybe give it a shot and go from there.