Nvvidconv dGPU or Tegra

Nvvidconv plugin not found on dGPU machine but I can find it in Jetson. Is nvvidconv only for Tegra?

Yes. nvvidconv is Jetson only. With DeepStream installed, nvvideoconvert can work on both Jetson and dGPU.

https://docs.nvidia.com/jetson/archives/l4t-archived/l4t-3243/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide%2Faccelerated_gstreamer.html%23wwpID0E0VM0HA
https://docs.nvidia.com/metropolis/deepstream/dev-guide/index.html#page/DeepStream%20Plugins%20Development%20Guide/deepstream_plugin_details.html#wwpID0E0TV0HA