Maybe you are the same guy davzoltan on GitHub, right? This is the response from the developer
As I don't have discrete GPU PC, I don't have any pipeline example using nvdec.
But according to https://codetricity.github.io/theta-linux/optimization/#configuration-with-v4l2loopack-on-devvideo ,
I guess
`thetauvcsrc ! queue ! h264parse ! nvdec ! gldownload ! queue ! videoconvert n-threads=0 ! video/x-raw,format=BGR ! queue ! appsink`
may work.
Of course, above example isn't optimal, so additional tuning is needed for better performance.
nvdec, gldownload, glimagesink works with thetauvcsrc
gst-launch-1.0 thetauvcsrc ! queue ! h264parse ! nvdec ! gldownload ! queue ! videoconvert n-threads=0 ! video/x-raw,format=BGR ! queue ! glimagesink