This is in the release note for v5.3
vGPU/MDev and PCI passthrough. GUI for configuring PCI passthrough and also enables the use of vGPUs (aka mediated devices) like Intel KVMGT (aka GVT-g) or Nvidias vGPUS.
Anyone tried to share vGPU on proxmox? I'm particularly interested to have a few KVMs...