As flohofwoe has pointed out, yes this can currently be done using Nvidia specific extensions.
If you are interested, a friend of mine and a few coworkers pieced together a small proof-of-concept game engine in their spare time that uses Vulkan ray tracing on Nvidia RTX cards. They finally released it on GitHub a few days ago:
There are days when I wish that DirectX was the open standard, rather than the other way around. It's such a cleaner, better designed API - quite possibly because it was not open, and so it doesn't have anywhere near as much of the design-by-committeeisms that infect OpenGL/Vulkan.
https://www.khronos.org/registry/vulkan/specs/1.2-extensions...
I guess this will first be elevated to a vendor-neutral extension and (I guess) eventually will move into the core API.