title: OpenCV-Python cv2.CV_CAP_PROP_POS_FRAMES error
body: <p>Currently, I am using opencv 3.1.0, and I encountered the following error when executing the following code:</p>
  
  <pre><code>post_frame = cap.get(cv2.CV_CAP_PROP_POS_FRAMES)
  </code></pre>
  
  <p>I got the following error Message:</p>
  
  <p>File "videoOperation.py", line 37, in 
      pos_frame = cap.get(cv2.CV_CAP_PROP_POS_FRAMES)
  AttributeError: 'module' object has no attribute 'CV_CAP_PROP_POS_FRAMES'</p>
  
  <p>The code should be written in the following format when using OpenCV 2.x:</p>
  
  <pre><code>post_frame = cap.get(cv2.cv.CV_CAP_PROP_POS_FRAMES)
  </code></pre>
  
  <p>From <a href="https://stackoverflow.com/questions/30013009/opencv-3-0-0-dev-python-bindings-not-working-properly">opencv 3.0.0-dev python bindings not working properly</a>, I know that </p>
  
  <blockquote>
    <p>the cv2.cv submodule got removed in opencv3.0, also some constants were changed</p>
  </blockquote>
  
  <p>But the cv2.CV_CAP_PROP_POS_FRAMES didn't work for me, So what am I supposed to do?</p>