Self-parking cars are already available on the market. Mercedes-Benz is working on a technology that would take the idea to the next level by allowing you to move your car in or out of parking spaces using your smartphone. The Remote Parking Pilot system relies on Bluetooth to connect to your smartphone, allowing you to stay outside your car while maneuvering it in or out of a space.
The above video shows how the Remote Parking Pilot system works. You can find out more here.