#iOS 4 supports Full Camera Access. I made a simple marker tracking demo using the new camera API.

As announced in WWDC2010, iOS 4 supports Full Camera Access. I made a simple marker tracking demo using the new camera API. It was very simple and straightforward to use.

via mobile-augmented-reality
http://mobile-augmented-reality.blogspot.com/2010/06/marker-tracking-demo-on-ios-4-gm-seed.html