title: How to install OpenCV in Docker (CentOs)?
body: <p>I am trying to install OpenCV in a docker container (CentOS).</p>
  <p>I tried installing python first and then tried <code>yum install opencv-contrib</code> but it doesn't work.</p>
  <p>Can someone help me out as to how to install OpenCV in Docker (CentOS)?</p>