Hi,
This looks to be about how to use X functions. Since we don’t have much experience in enabling transparent background, this would need other users to share experience.
Another solution is to have single X window and use NvBufSurface APIs to achieve the same behavior. We have NvBufSurfTransformMultiInputBufCompositeBlend() which supports alpha blending. And you can use CUDA programming to access each pixel of NvbufSurface like:
Resources for custom nvivafilter for Jetpack 5.1.1 Jetson NX - #17 by DaneLLL