How can I install Gstreamer plugins for rockchip hardware codec support?

I download rock-3a-debian-buster-xfce4-arm64-20220701-0158-gpt.img from radxa github site and wrote it into my rock3a board. The board boot up successfully with a xfce desktop. But I can not find any gstreamer plugins for rockchip hardware codecs support. Could you please someone give some hints on this?

they are build in

just read the docs how to use it

cho -e “\033[36m Setup Video… \033[0m”

apt-get install -y gstreamer1.0-plugins-bad gstreamer1.0-plugins-base gstreamer1.0-tools gstreamer1.0-alsa \

gstreamer1.0-plugins-base-apps qtmultimedia5-examples

apt-get install -f -y

dpkg -i /packages/mpp/*

dpkg -i /packages/gst-rkmpp/*.deb

dpkg -i /packages/gst-base/*.deb

#apt-mark hold gstreamer1.0-x

apt-get install -f -y

Thanks for the reply.
I am just learning recent days on how to use it but can not arrive. I did
gst-inspect-1.0 | grep mpp
but no success. Could you please kindly give a hint how can I find a rockchip mpp gst plugins under current radxa debian or ubuntu image?

well use the examples instead of trying to find with inspect

and more i cant tell it is there