how to tell the motor to rotate left or right for real time motion detection and traking

im a final year student and and i working on real time motion detection and tacking but i have no idea how to tell the motor to rotate left or right in the direction of motion. also which motor and webcam to use for my project can any one help me. can i use 8051 micro controller to control motor position but how will i use matlab to communicate with the mico controller?