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Object detecting and camera tracking in a large range of distances is still important problem in the research field of security and more recently also in the research field of assistive technologies too, when it is necessary to monitor intruders in the protected perimeter or elderly and disabled people both in hospital and at home. This paper discusses the design of an automatic stereoscopic video system using two identical pan-tilt-zoom (PTZ) cameras. A PTZ camera can provide a detailed live video of selected areas within a large potential field of view. Using two such cameras the TV system can be enriched by the possibility of estimating distances of monitored object or monitoring of two selected areas simultaneously. It means that both cameras can be jointly driven as a stereoscopic pair or can be run independently.