HELLO GUYS,IF YOU HAVE YOUR ANDROID phone there billions of productive apps in app store like the app called ip camera. download it from app store it's free and set it up .CONNECT WIFI OR internet in you computer and android .launch IP CAMERA
ip address will develop along with port number. open your browser on computer and on the search bar type the ip address and port number then press enter. An android webcam server would open,click on[Use browser built-in viewer (not supported by some browsers)] the video stream will start you can also enable audio and flash light .now you dont have to spent much money on expensive security system.