Qground control / px4firmware / STORM 32 / mavlink /pixhawk

Dear all
Is the any step-by-step manual how to connect popular STORM32 based gimbal to qground control and allow user to control this gimbal manul using mavlink connection only?

My connection looks currently as follow:


What are the next steps for PX4 firmware users ? Can I do manul control over this connection or should I add something else or migrate to ardupilot firmware with mission planner and continue with steps presented on mission planner pages:

@mocart were you able tobise Storm32 with PX4?