I was able to install Emby on Docker with NVIDIA hardware acceleration without too much fuss, though I had to rely on a few different instructionals. Below are the steps I took get it to work (assuming you already have docker installed) on Ubuntu 19.04, for any other noobs trying to piece this all together:
Step 1: Install container directly from Docker Hub (assuming Docker is already installed)
docker pull emby/embyserver:latest
Step 2: Install nvidia-container-toolkit and nvidia-contain