title: Install OpenCV for systemwide Python on MacOS
body: <p>I have three versions of python:</p>
  
  <p>python  (2.7.10, default systemwide version shipped with MacOS)</p>
  
  <p>python2 (2.7.15, installed with brew)</p>
  
  <p>python3 (3.6.5, installed with brew)</p>
  
  <p>I installed opencv for python2 and python3 using pip2 and pip3, respectively. However, I have a matlab application (VOT-toolkit) which generates a command as: /usr/bin/python -c "import cv2" which fails since /usr/bin/python refers to the systemwide python version which does not have opencv installed. </p>
  
  <p>Is there a way I can install opencv for the systemwide python version? (If possible, directly using pip without having to build from sources)</p>
  
  <p>Thanks!</p>