We are looking at using herelink with a zoom camera gimbal. I really like the Herelink but one problem is the amount of control buttons / scroll wheel.
Joystick control is now separate to the RC sticks for safety reasons I believe. You want to be looking at controlling the gimbal via another RC or via the buttons really.
Having the gimbal take over stick control is not ideal from a safety or practical point of view.
My solution was a teensy microcontroller witch some code which made the gimbal and the camera MAVLink compatible,then wrote a plugin in Mission Planner to control the gimbal and the camera via MAVLink (Not RC_OVERRIDE) with an XBOX controller An using mission planner via the Wifi hotspot of the Herelink
I see people have been using herelink with onscreen zoom functions in qgroundcontrol with ardupilot is there no way this can be done with px4