Hi @rasa, if it’s part of your package then I would recommend going with the Tobii Pro SDK as this comes supplied with a number of sample applications that indeed demonstrate simply how to store gaze data.
I am afraid we do not have a documentation or samples for the Core SDK that store gaze data in the fashion you want as this is generally an uncommon user setup.
In any event, please check with your sales contact if you will be able to work with the Pro SDK. Thanks.