COMPUTER CHROMAKEY HARDWARE SYSTEM COMPRISING A CAMERA HEAD AND A TRIPOD THAT READS THE PAN, TILT AND ZOOM POSITIONS OF THE VIDEO CAMERA AND A PLAY-BACK UNIT FOR DISPLAYING BACKGROUND IMAGES IN CORRECT PERSPECTIVE RELATIVE TO THE FOREGROUND IMAGES, WITH THE SYSTEM CONTAINING EMBEDDED COMPUTER PROGRAMS FOR USE IN COMBINING TWO VIDEO SOURCES, NAMELY A BACKGROUND SOURCE AND CHROMAKEYED FOREGROUND IMAGERY