https://docs.nvidia.com/metropolis/deepstream/dev-guide/sdk-api/9_80_2sources_2libs_2gstnvdscustomhelper_2gst-nvdscustommessage_8h.html
NVIDIA DeepStream SDK API Reference: gst-nvdscustommessage.h File Reference | NVIDIA Docs
sdk api referenceh filenvidiadeepstreamgst