title: Opencv imshow crashes python launcher on macOS 11.0.1 (Big Sur)
body: <p>I'm trying to run some old code from gaussian filter when I find out that python launcher gets stuck trying to do the imshow function.
  I tried:</p>
  <ul>
  <li><p>Used Matplotlib to display a graph to see if the python launcher was the problem but no, graph showed up fine.</p>
  </li>
  <li><p>Remove process in between just to have the image read and display in fear that something in my code was breaking the launcher but no success.</p>
  </li>
  <li><p>Reinstalled opencv-python but no success.</p>
  </li>
  </ul>
  <p>Also saw one question like this in the google search but OP deleted it.</p>
  <p>Has anyone encounter this issue or has any fix for this?</p>
  <p>Example code:</p>
  <pre><code>import cv2 as cv
  filename = 'chessboard.png'
  img = cv.imread(filename)
  cv.imshow('dst',img)
  cv.waitKey(0)
  </code></pre>
  <p>OS: MacOS Big Sur (11.0.1)</p>