Webcam capture with OpenCV and Tkinter: multithreading

Python, Tkinter, OpenCV, alright! lets check multithreading:

On multithreading with Python, recommended lecture:
http://www.python-course.eu/threads.php
Threading with queues:
http://www.nryoung.org/blog/2013/2/28/python-threading/
Discussion:
http://stackoverflow.com/questions/2846653/python-multithreading-for-dummies

Starting point for multithreading with Tkinter:
http://stackoverflow.com/questions/459083/how-do-you-run-your-own-code-alongside-tkinters-event-loop

Maybe threading is not the answer, GIL:
http://www.jeffknupp.com/blog/2012/03/31/pythons-hardest-problem/

"in any Python program, no matter how many threads and how many processors are present, only one thread is being executed at any time."

So, multiprocessing is the way to go.