Hi @rasa, thanks for your query. Please bear in mind that the use of Eye Tracking for analysis or research purposes that requires the long terms storage of gaze data requires the purchase of a special licence to do so.
However, if you are simply interested in use the EyeX for Interaction applications, then there are a number of sample programs you can get for free @ https://github.com/Tobii/CoreSDK
Hopefully these should help you get and up running.
Please let us know if we can be of any further help.