title: How to add facial recognition based login in ubuntu/linux?
body: <p>I have written a code (in python) to detect my face. Now I want to add this feature for login in my Ubuntu system. I searched over internet but cannot find suitable answers. </p>
  
  <p>I want to display an option/icon to select facial recognition and on clicking that, my facial recognition code starts running in background. How I can achieve it? Please explain exactly where I need to make changes in ubuntu system for enabling and using such option?</p>