One of the most important components in your video equipped, flying drone is the gimbal.  This device keeps the camera level and vibration proof at all times during flight.  Older models use mechanical servos and input directly from the flight control system.  Newer models offer better performance and reliability with brushless motors and separate gimbal stabilization circuit board(s).  They often come with accompanying software which provides a graphical interface via USB cable for setup, upgrade and tuning.