title: Add blur image background to a xib programmatically
body: <p>I have recently started dealing with my interface programatically and I want to set an image as background of my storyboard and then make it blur . 
  I've seen sample codes like the following : </p>
  
  <pre><code> UIImageView *backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Wormhole.jpg"]];
  [self.view insertSubview:backgroundView atIndex:0];
  </code></pre>
  
  <p>but as I said I am quit new to this . Can some one please explain how it works ? and where should I use it ? </p>