Capture pic from web cam (xCode)

Need simple program, written using xCode 4.2 for Mac: 1. Searches and connects to web cam (built-in or external, we must decide how to work with several connected cams) 2. Take a picture from web cam 3. Save picture to folder (library, program folder) 4. disconnect from web cam Thats all! Must be simple. No third-party controls, libraries or other. Minimum GUI, or no at all.