streamer cannot detect nvdec plugin when GPU enabled under nvidia-docker2

Gaming and Visualization Technologies Video Processing & Optical Flow
1

I successfully built docker container using gstreamer with nvdec.
However, when I run container, I couldn’t use nvdec as below.

Dose someone have any idea?

It seems enabling gpu hides nvdec plugin.

$ docker run -it -e NVIDIA_DRIVER_CAPABILITIES=all --rm --name=gst gst2  gst-inspect-1.0 | grep nvdec
nvdec:  nvdec: NVDEC video decoder

$ docker run --runtime=nvidia -it -e NVIDIA_DRIVER_CAPABILITIES=all --rm --name=gst gst2  gst-inspect-1.0 | grep nvdec

Shared libralies are exist in both cases.

$ docker run -it -e NVIDIA_DRIVER_CAPABILITIES=all --rm --name=gst gst2  ls  /usr/local/lib/gstreamer-1.0 | grep nvdec
libgstaudiobuffersplit.la    libgstnvdec.la
libgstaudiobuffersplit.so    libgstnvdec.so

$ docker run -it --runtime=nvidia -e NVIDIA_DRIVER_CAPABILITIES=all --rm --name=gst gst2  ls  /usr/local/lib/gstreamer-1.0 | grep nvdec
libgstaudiobuffersplit.la    libgstnvdec.la
libgstaudiobuffersplit.so    libgstnvdec.so