At SIGGRAPH 2017, Nvidia announced Optix 5.0, the latest revision of its GPU-based ray-tracing API.
Nvidia Announces OptiX 5.0 With AI-Based Denoising : Read more
Nvidia Announces OptiX 5.0 With AI-Based Denoising : Read more
The standard way to do motion blur in global-illumination ray tracers is to use stochastic sampling in both space and time. Even with AI denoising, you'll need more than one ray per pixel, for this.The OptiX 5.0 framework also includes provisions for GPU-accelerated motion blur, presumably using some technique other than simply rendering a frame multiple times and blurring them together.