run /usr/lib/arm-linux-gnueabihf/qt5/examples/multimediawidgets/player/player
You can click the bottom right corner to switch between eglglesisnk(gpu) and rkximagesink(drm)
This is qtmultimedia's rockchip version to support gstreamer-rk
The video stack is: vpu -> mpp -> gstreamer-rk -> qtmultimedia -> player