Congratulation on a very nice product, high quality and feature rich app.
One suggestion to make interacting with the Pan and Tilt more intuitive, would be to have a direct video drag option in addition to the control wheel.
Basically just dragging the video with the finger could drive the camera pan and tilt. If you dragged the video to the left, it would rotate the camera right to reveal what is there, dragging to the right would do the reverse, and similar for dragging up and down.