Commercial example:

The Skycam is a cable-driven large-envelope robot that carries a fairly heavy load (a steadicam and some control electronics) over the filed at sporting events to enable previously impossible angles on the action. The flying part (camera and electronics) only needs to actuate pan/tilt, since the four winches driving the cables are located near the four high corner points of the stadium. The system is very fast and accurate and allows the operator to quickly move the camera to anywhere inside of a defined envelope, with safety boundaries established so the device and its cables won’t hit any people or equipment during flight.