[request] Support for cv::cuda::GpuMat

[anand97]

I fetch images from a camera directly in GPU memory, and then run them through a neural net on the GPU. Since the CCTag library already supports CUDA, I think a useful addition would be to accept a cv::cuda::GpuMat which is already in GPU memory, which will avoid an additional copy operation out of the GPU. It behaves similar to a cv::Mat as well, which should make implementation easy. Currently the cctagDetection method accepts a cv::Mat.

I am not well versed with the source code to try this out on a fork myself, but I'm happy to discuss and assist building this feature as it will help my work as well.

[github-actions]

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