Implementing SGBM block matcher in CUDA

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Hello,

i just wanted to ask about your advise.

I need to use the SGBM (semi-global block matcher) to get a accurate disparity map. The SBM (stereo block matcher) is delivering quite bad and unuseful results.

The problem is just, that it seems that SGBM is not implemented in OpenCV CUDA yet (but the SBM).
But i need the SGBM to work faster (for example on the GPU).
Would you say it is possible to implement it in CUDA in a few days with not much experience in CUDA C programming?
And is it btw a good idea to implement it, or are the for example already good alternatives for it?