title: Could not load the Qt platform plugin (while dockerizing the application)
body: <p>I have built a face detection app using opencv and transfer learning model (resnetSSD).
  Output of application  : video will open and model will be able to recognize the faces.</p>
  <p>Application is running perfectly in my local system .. Able to build the docker also , but when running the docker container below error i am getting:</p>
  <pre><code>qt.qpa.plugin: Could not load the Qt platform plugin &quot;xcb&quot; in &quot;/usr/local/lib/python3.6/dist-packages/cv2/qt/plugins&quot; even though it was found.
  This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
  
  Available platform plugins are: xcb.
  </code></pre>
  <p>please suggest how i can fix this ??</p>