Not found this myself yet (like in VPro 11 Preferences / Video). In Render as, The Sony AVC Template / Custom settings / System > check GPU shows CUDA is available. Turned Render Using GPU If Available on in Video Encode Mode and made a test render with the free GPU-Z software's sensors showing this kind of behaviour.
Have not made any comparisons On/Off yet.
edit: with CPU only clearly faster in my case,
video card Cuda Compute capability 1.2.
Using VMS 11 Platinum build 283, Nvidia drivers 285.79 beta.
Support for GPU-accelerated AVC rendering using the Sony AVC plug-in.
In v11 release notes:
GPU-accelerated rendering performance will vary depending on your specific hardware configuration. If you have an older CPU and a newer GPU, rendering using the GPU may improve render times.