User hodilton posted a video on YouTube, in which, on the example of The Witcher 3: Wild Hunt, he presents the capabilities of an early experimental version of Marty McFly's RT Shader by Pascal Gilcher.
Although Marty McFly's RT has little in common with real ray tracing, it has quite an important advantage, which is mentioned by the author of the solution:
"The benefits of this shader is that it can run on every game and GPU and itís a step up from regular SSAO. I hope this serves as a sneak peek at what DXR ray tracing can do and why everyone in vfx canít wait to get real ray tracing for their games."
Marty McFly's RT Shader is still in the early stages of development, so there are a lot of graphical issues in the video - especially in outdoor scenes, where there are problems with brightness and color saturation. Currently, only people supporting Pascal Gilcher on Patreon have access to the shader. In the future, when the project develops slightly more, Marty McFly's RT is to be made available to the public.