title: How can I merge 2 videos together in OpenCV? Similar to that of a SimulCam
body: <p>I am looking for a way to combine/blend 2 videos irrespective of alignment in OpenCV.</p>
  
  <p>I have 2 videos of the same scene, one is a ball rolling fast, the other slow from a standardised start point.</p>
  
  <p>I have managed to work out how to use AddWeighted() previously to blend two images together, but have little knowledge of performing something similar for Videos.</p>
  
  <p>I understand that it involves reading frames of the respective sources and processing them.. but that is all.</p>
  
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  <p>Any help or direction would be greatly appreciated.</p>