The forum seems not very active. I am also struggling, but maybe what I got so far can help someone.
The problem with OpenCV is that you need the image to be in CPU memory. So first you need to copy it somehow from GPU.
I used AsyncGPUReadbackRequest for it. Now I am stuck on how to Apply this modified Texture back to SRWorks.
Here is my code:
public class OpenCVMat : MonoBehaviour