title: How to make video wall with iPhone SDK
body: <p>I need to generate video file with iphone SDK that looks like a wall of few smaller videos. Did somebody could help me with advice how to implement this? I am currently thinking of images with frames, that placed in UIView in needed order and then assemble them in one final video, but I can't find how to do it.</p>
  
  <p>Here's how it should look:  </p>
  
  <p>| video1 | video2 |<br>
  | -------- | --------- |<br>
  | video3 | video4 |<br>
   Thanks.</p>