title: saving a video that has background subtraction applied to it in python 3.5 using open cv
body: <p>I have tried looking for the answer to my question but I have not really found an answer. I am wondering how to save a video file in python 3.5 that has background subtraction applied to it and in addition curious as to where the output file is supposed to be saved to?</p>
  
  <p>Thanks in advance</p>