Camera related links:
OpenCV
• http://answers.opencv.org/question/14899/motion‑detection‑with‑opencv‑c/ 
Motion Detection and Speed Estimation using OpenCV
• http://hardikmadhu.blogspot.com/2013/09/a‑simple‑and‑minimal‑aproach‑to‑human.html 
• Contour based Action Detection.c