1. A method for tracking an object of interest that is embedded within images of a scene, comprising: (a) in a sensor unit that includes movable sensor, generating, storing and transmitting over a communication link a succession of images of a scene; (b) in a remote control unit, receiving the succession of images; (c) receiving a user command for selecting the object of interest in a given image of said received succession of images or derivative thereof, determining object of interest data associated with said object of interest and transmitting through said link to said sensor unit at least said object of interest data; (d) in the sensor unit: identifying the given image of the stored succession of images and the object of interest using said object of interest data, and tracking the object of interest in at least one other image of said stored succession of images, said other image being later than said given image; (e) in case that said object of interest cannot be located in the latest image of said stored succession of images, using information of at least two images in which said object of interest was located to predict estimated real-time location of the object of interest and generating direction command to the movable sensor for generating real-time image of the scene and locking on said object of interest.