title: Best way to detect a light blinking from video footage via python
body: <p>I have some video footage and wish to analyse when a light source blinks. The light source is at the same location, so should easy to work with the ROI. </p>
  
  <p>I'm used to working with python, but not very strong when it comes to video analyzing - don't care that much about formats and technical stuff. Just wish to find a quick a dirty way of detecting this.</p>
  
  <p>My current approach would be something like this</p>
  
  <ol>
  <li>Load the video </li>
  <li>Extract an image from the video in order to elect region of
  interest (ROI) by drawing a rectangle (do hope there is an easy
  module for this) </li>
  <li>Go through the entire video to detect pixel changes
  in the ROI </li>
  <li>Log/plot the time when the changes exceed a treshold</li>
  </ol>
  
  <p>I'm pretty sure someone has done something similar, so links to any useful modules, tutorials or handy software would be great. Thanks.</p>