Hi,
Please refer to the documents:
Jetson Linux API Reference: 08_video_dec_drm (Direct Rendering Manager) | NVIDIA Docs
There are steps of running the sample in default release. Suggest you check if you can run it successfully on default release first and use it as a reference for comparing the environment. NvDrmRenderer.cpp is implemented based on DRM APIs. If you can other DRM samples working, 08_video_dec_drm should work fine.