@m_tsourma ,
yes you can use the code if you like, "knowledge is there to be shared " 
I'll do a quick test to see if face detection on the rpi2 gives usable results,
Face detection is pretty heavy computation, even for some desktop computers.
But hey, now I'm curious to see what frame rate we can get.
If you can save money on something else somehow than I recommend you get an RPI2!
It is much more fun 