Iphone 4 - Is it possible to capture a camera event (takePicture) in a background application

Is it possible to have a background background 开发者_运维百科app. notified in case of a camera event generated by the native OS app?

The app sandbox prevents apps from knowing what other apps (including the Camera app) are doing except via explicit communication (e.g. registered URL handlers, shared VOIP network connection, etc.), at least under the stock OS when sticking to apps that comply with the SDK agreement.