title: error while saving video file using open cv
body: <p>program:</p>
  
  <pre><code>import numpy as np
  import cv2
  
  cap = cv2.VideoCapture(1)
  fourcc = cv2.VideoWriter_fourcc(*'VID')
  out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))
  
  while(True):
      ret, frame = cap.read()
      gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
      out.write(frame)
      cv2.imshow('frame',gray)
      if cv2.waitKey(1) &amp; 0xFF == ord('q'):
          break
  
  cap.release()
  out.release()
  cv2.destroyAllWindows()
  </code></pre>
  
  <p>error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "D:/ANIKET/python projects/img_process.py", line 5, in &lt;module&gt;
      fourcc = cv2.VideoWriter_fourcc(*'VID')
  TypeError: Required argument 'c4' (pos 4) not found
  </code></pre>
  
  <p>i m trying to save the video file.
  but i m getting this error.
  plz tell me what i am doing wrong</p>