Detect Objects through Camera [Camera recognizing images]

I want a program that is connected to a webcam/camera whereby if camera sees the object he gives an alert that the object has been recognized. So lets say I see a specific car that I like; the camera will recognize it based on the images of the car that is saved and will compare to it if its that car. If he thinks its that car he will take a snapshot and I will see if its true or not.