I just wanted to mention that you can find my source code now on github:

 

https://github.com/generationmake/InfraPi

 

That is the code with which I made all the videos and screenshots. It also can log the temperature in a seperate log file. It is a command line tool and has several arguments to turn the different output functions on and off.

 

The program is writen in C++ and uses the OpenV library.