title: How to combine two videos in one ? (Cocoa)
body: <p>I'm am trying to make a simple app for mac os which will be able to combine two different videos (.mov) into one ? </p>
  
  <p>I've been searching for answers on the web but nothing helped me.</p>
  
  <p>I've just heard about AVMutableComposition..</p>
  
  <p>Premising that I'm quite new to cocoa, could anyone give me some points to find out a solution to my issue ?</p>
  
  <p>Thank you in advance.</p>