The invention is directed at a method of obtaining gesture zone definition data for a control system based on user input, wherein said user input is obtained through a mobile communication device external to said control system, the method comprising: receiving, by an image capture device, images of a space, and determining from the images, by a controller, a location data of the mobile communication device; providing, through the mobile communication device, a feedback signal in response to said determining of the location data, the feedback signal providing feedback information on said location data; receiving, via an input unit of the mobile communication device, an input signal indicative of an instruction command, and determining, by the controller, based on said instruction command, the gesture zone definition data. The invention is further directed at a method of operating a mobile communication device, to a computer program product, and to a control system.