Hello Gianni,
I’m sorry to say it is not possible to access the EyeX Engine from a Windows Store app. Microsoft has done their best to ensure that the Windows Store environment is isolated from the underlying OS, and they have done a thorough job — not even the Kinect can get through.
If you own a Microsoft Surface Pro with a USB 3 port, you should be able to build regular desktop applications, but no Windows Store applications.
Best regards
Patrik