title: kalman 2d filter in python
body: <p>My input is 2d (x,y) time series of a dot moving on a screen for a tracker software. It has some noise I want to remove using Kalman filter. Does someone can point me for a python code for Kalman 2d filter?
  In scipy cookbook I found only a 1d example:
  <a href="http://www.scipy.org/Cookbook/KalmanFiltering">http://www.scipy.org/Cookbook/KalmanFiltering</a>
  I saw there is implementation for Kalman filter in OpenCV, but couldn't find code examples.
  Thanks!</p>