Hi Maija,
the EyeX SDK and the Gaze SDK can be used in parallel, in the same application, but it’s not something that we recommend because it’s complex and difficult to get right. But if you still want to try it, here is how:
-download the Gaze SDK .NET API package (for Win32)
-unzip and go to the lib directory
-copy the Tobii.Gaze.Core.Net.dll to your Unity Plugins directory
-copy the TobiiGazeCore32.dll to your Unity project directory.
This will give you access to all the classes in the Tobii.Gaze.Core namespace from within the Unity environment. Check out the documentation and the code samples in the Gaze SDK package to see how it works.
What is it that you’re building that requires the use of the low level Gaze API?