Oculus Tiny Room is linked, but Valve also has a pretty good minimal Vulkan + OpenVR example in the OpenVR SDK called hellovr_vulkan (https://github.com/ValveSoftware/openvr/blob/master/samples/...).

On HN this might be attractive because people tend to complain about Windows only software, and all of Valve's samples use SDL and in theory run on Mac OS X and Linux. The OpenVR example is a little bit more verbose, but it does have some extra functionality, like drawing render models (controllers) provided by the API.