Hi @tiagomcoliveira and thanks for your query. I am afraid that the Unity for Desktop API is designed to operate only with the Tobii Tech range of Eye Trackers which include the 4C and ET5. The PCEye Mini is produced for the Dynavox Business department which is tailored toward the accessibility market.
Accordingly, we cannot officially endorse the use of this product in conjunction with the Unity SDK. Our apologies for any inconvenience caused.