How do I make sure that my game is working with Vulkan when using DXVK on Windows?

DXVK is a "mod" for games originally developed for DirectX 9, 10 and 11 that allows them to run with Vulkan instead of DirectX.

Is there a way to make sure that the game where I installed DXVK to is actually using Vulkan? For some games like GTA IV, is very easy to know due to big performance improvements when compared to DirectX, but other ones do not.