title: Basic GPUImage iOS7 app video freezes / not working
body: <p>I am new to GPUImage and I added GPUImage to a Default Single-View template Xcode 5.1.1 app. I successfully the static GPUImage library and I am trying the example from Readme file. I have iO S7.1 as base SDK. The app compiles and loads and the video just freezes. It freezes with or without the Filter.
  How do I fix this? I want to display live camera preview with a filter applied to it</p>
  
  <p>The examples included in github repo compile and run fine.</p>
  
  <pre><code>- (void)viewDidLoad
  {
      [super viewDidLoad];
      // Do any additional setup after loading the view, typically from a nib.
      GPUImageVideoCamera *videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPreset352x288 cameraPosition:AVCaptureDevicePositionBack];
      videoCamera.outputImageOrientation = UIInterfaceOrientationPortrait;
  
      GPUImageFilter *customFilter = [[GPUImageSepiaFilter alloc]init];
      GPUImageView *filteredVideoView = [[GPUImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320, 320)];
      [self.view addSubview:filteredVideoView];
      // Add the view somewhere so it's visible
  
  
      [videoCamera addTarget:customFilter];
      [customFilter addTarget:filteredVideoView];
  
      [videoCamera startCameraCapture];
  }
  </code></pre>
  
  <p>Here is the screen capture from my iPhone 5 running iOS 7.1.</p>
  
  <p><img src="https://i.stack.imgur.com/Z3TDJ.png" alt="camera with frozen video"></p>