DJI recently put active track on the Ronin S App. To use it you have to connect your Phone to your gimbal, then you can choose an object to track an your phone which passes all information to your gimbal. To really use the function you have to put your phone on your camera. There are buying solution, but i have a SP Lock phone case for motorcycling and hate changing my cases. So i just build this one.

Note: Watch out the cold shoe mount holds on properly.