Like the title said, I would like to know what Gimbal will work with CamTrackAR?
Any gimbal should work. The gimbal is a hardware device and, even if CamtrackAR doesn't "talk" to the gimbal, the app will record by tapping the screen controls instead of the gimbal button. The gimbal just does its job .
Here is an article on the best Phone gimbals in 2020, https://www.nytimes.com/wirecutter/reviews/best-android-and-iphone-gimbal/
I've used my DJI Osmo mobile 2 with it, and it's worked really well