You will first need to open terminal and run intel_gpu_top to confirm what your iGPU's identifier is (card0 or card1). In the below screenshot my iGPU is card1/renderD129, which means my Nvidia GPU (by process of elimination) is card0/renderD128.
Next edit your docker container and enable advanced view. Under "Extra Parameters" enter the following command.
In my case i am directing card1 to card0 and renderD129 to renderD128 in order to stop docker from targeting my Nvidia GPU when trying to run QSV operations.
--device=/dev/dri/card1:/dev/dri/card0 --device=/dev/dri/renderD129:/dev/dri/renderD128
Once you've saved, run a test and you should see activity on your iGPU.
