title: Opencv python package manage
body: <p>Recently I used opencv Python to handle Video Steam.
  Normally I should install opencv-python via pip.
  However I found that the opencv-python in pypi is unofficial package.
  And it's just a package with opencv core, which does NOT including packages like contrib and FFmpeg...
  If you wanted a version of opencv with extra packages, you should possibly download the opencv source code and build your own Opencv Python Bindings.</p>
  
  <p>For me, this is not a friendly way to manage Opencv compared to other python libs in pypi.</p>
  
  <p>Does anyone have a more elegant way to manage opencv python in both Mac and Linux OS please?</p>