gistfile1.swift

let camera = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
var error : NSError? = nil
let cameraInput : AVCaptureDeviceInput? = AVCaptureDeviceInput.deviceInputWithDevice(camera, error: &error) as? AVCaptureDeviceInput
self.session.addInput(cameraInput)
        
if error != nil || cameraInput == nil {
    //Awesome error handling :D
    println(error!.localizedDescription)
}
else {
    let cameraOutput = AVCaptureMetadataOutput()
    cameraOutput.setMetadataObjectsDelegate(self, queue: dispatch_get_main_queue())
    self.session.addOutput(cameraOutput)
    cameraOutput.metadataObjectTypes = cameraOutput.availableMetadataObjectTypes
            
    self.previewLayer = AVCaptureVideoPreviewLayer.layerWithSession(self.session) as AVCaptureVideoPreviewLayer
    self.previewLayer.frame = view.bounds
    self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
    view.layer.addSublayer(self.previewLayer)
            
    self.session.startRunning()
}