Hi @my5tery, yes that’s right. The simple c++ code above is just to get the basic gaze co-ordinates and yes is a cpp file. I am afraid that the Stream Engine SDK is designed to work with an IDE so you will certainly need some kind of development environment to get started and thereafter hopefully can integrate with your RVIZ solution. Please let us know how you get on in this regard and we will try to help best we can.
Please bear in mind that as stated in the original Core SDK Stream Engine API homepage that the linux variant is still in early alpha and designed for advanced users so detailed support will be limited. Never the less, please try first compiling the above code and report back here on your progress. Best wishes.