I can't reproduce example [Backend](https://docs.nvidia.com/jetson/l4t-multimedia/nvvid_backend_group.html)

example Backend
I can compile the program normally and execute the sample command successfully, but I don’t show the result of video analysis

The program is stuck here all the time, and there is no display.The same is true in the graphical interface.Finally, an unknown error occurred.

Please set DISPLAY before running the sample.

nvidia@nvidia-desktop:~$ export DISPLAY=:0

I met a new problem. After executing the command, I had to wait a long time to display the screen, but after the screen appeared. The system went out immediately, but the fan was still working.

Thank you very much for the successful reproduction of this program

At beginning of running the sample, it generates model cache and it takes some time. After that it should start to run. For getting max performance, you can run sudo nvpmodel-m 0 and sudo jetson_clocks

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