The ability to reliably detect and track human motion is a useful tool for higher-level applications that rely on visual input. Interacting with human motions and understanding their activities are at the core of many problems in intelligent systems. In this paper motion detection system is based on embedded RT Linux OS. In the existing technology are used as a passive in nature i.e. the monitoring systems only help in detecting the crime but do not actively participate in stopping or curbing the crime while it takes place.