Hi,
Here is a post about EGLStream producer/consumer:
Problems getting EGL Stream transferred to another process on same machine - #7 by DaneLLL
But it is not YUV buffers. On Jetpack 4.6, there is functions defined in nvbuf_utils.h for sharing NvBuffers between processes, but the sample is not ready yet.
Here is a relevant post:
How to share the buffer in process context？ - #8 by DaneLLL