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copied!<p>After AVCaptureSession allocation you may use:</p> <pre><code>NSNotificationCenter *notify = [NSNotificationCenter defaultCenter]; [notify addObserver: self selector: @selector(onVideoError:) name: AVCaptureSessionRuntimeErrorNotification object: session]; [notify addObserver: self selector: @selector(onVideoStart:) name: AVCaptureSessionDidStartRunningNotification object: session]; [notify addObserver: self selector: @selector(onVideoStop:) name: AVCaptureSessionDidStopRunningNotification object: session]; [notify addObserver: self selector: @selector(onVideoStop:) name: AVCaptureSessionWasInterruptedNotification object: session]; [notify addObserver: self selector: @selector(onVideoStart:) name: AVCaptureSessionInterruptionEndedNotification object: session]; </code></pre> <p>These are calling back the relevant methods upon session.stopRunning, session.startRunning etc.</p> <p>There you should also implement some undocumented cleanup block:</p> <pre><code>AVCaptureInput* input = [session.inputs objectAtIndex:0]; [session removeInput:input]; AVCaptureVideoDataOutput* output = (AVCaptureVideoDataOutput*)[session.outputs objectAtIndex:0]; [session removeOutput:output]; </code></pre> <p>What I found confusing though is that upon calling seesion.stopRunning, onVideoStop: is called synchronously! despite Apple's asynchronous assumption on the case.</p> <p>Its working but please let me know in case you see any trick. I would prefer working with it asynchronously.</p> <p>Thanks </p>

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