See published papers on it: http://www.visionbib.com/bibliography/contentsmotion-f.html#Motion%20--%20Feature-Based,%20Long%20Range,%20Motion%20and%20Structure%20Estimates,%20Tracking,%20Surveillance,%20Activities
16.7.5 Surveillance Systems
16.7.5.1 Surveillance Systems, Applied to Retail Business, Shoppers, Shopping
16.7.5.2 Surveillance Systems, Applied to Fire and Flame Detection
16.7.5.3 Surveillance Systems for Smoke Detection, Aerial Image Smoke Detection
16.7.5.4 Hardware, Sensor and Camera Arrangements for Surveillance Systems
16.7.5.4.1 Camera Networks for Surveillance
Sorry, I don't have code for any of those papers. You'll have to ask the authors.
