Would love to, do you have specific things in mind to address? I was going to check if remap actually works and make example for it, but don’t quite understand for which augmentations you wanted to use it. Also, it might be interesting to compare cv::addWeighted with Tensor for mixup.
Yup I mentioned that in readme. They use Apache 2 license (like swift) that requires credit and specifying changes made, but doesn’t require using same license for your product.
OpenCV stopped updating their C API and actually removed it somewhere in 3.x. Gocv wrapper is alive and noted here as viable (but see, he mentions that they can’t handle C++ exceptions).
Another option would be to use code generation like existing OpenCV python wrapper - this would automatically cover all API, but sounds like a big project 
I’d love to learn more on that, was actually careless on that matter after reading this doc that says: The first thing you need to know about Mat is that you no longer need to manually allocate its memory and release it as soon as you do not need it. Perhaps it may not work with C wrapper.