This is a motorized focus and zoom DSLR Support rig.
Please see Below link for video of the motorized support rig:
Motorized follow focus that allows filmmakers to pull focus and steady the camera on the move, and makes it easier to achieve high-quality production value. With movable and height-adjustable base plate, it allows you to switch from different cameras without breaking down the whole system. Built with two sets of operation system, makes it easy to control the zoom and focus whether it is mounted on a tripod or on your shoulder. And its two motors on both sides of the rails are movable and interchangeable. Features : Comfortable shoulder pad Movable and height-adjustable base plate 2 sets of motorized zoom and focus operation system Movable and interchangeable motors With motorized zoom and focus operation system on the hand grips for easy control Adjustable speed for zoom and focus controlling.