Hi @vresu and thanks for your query. I understand that your question is if the Unity SDK has a blink detection algorithm built in? If that is so, then I am afraid that no, we have no such feature. In order to capture blinks, you would need to create your own code to do this based on a loop counter and gaze validity codes, where a typical blink lasts around 300-500 ms.
Sorry for the disappointing news, although perhaps you can find prebuilt samples online elsewhere by 3rd party developers.