camera2 api + cuda

I am computer vision engineer, and currently looking for a device for my hobby projects (want to run opencv computer vision on android).
First I need a tablet with camera2 API. (I want to get the camera control from c++ code), so I want to have INFO_SUPPORTED_HARDWARE_LEVEL FULL or 3.

Second (I didn’t thing about it before) I want to have a cuda development support.
So I wonder if nexus 9 supports both features, or pixel C is a better option?
What is about NVIDIA SHIELD?

I still can buy it, but i’m not sure if I have cuda support (and if it is a good option)
Thank you