Hi,
This is not implemented in default nvcompositor plugin. If you use the version > Jetpack 4.5, please download the source code from
https://developer.nvidia.com/embedded/l4t/r32_release_v6.1/sources/t186/public_sources.tbz2
And customize the plugin to include the function. The code is based on NvBufferComposite() in
/usr/src/jetson_multimedia_api/include/nvbuf_utils.h
Please check the header file for implementing the function.