OpenCV with cuda

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Hello, I am working on the TX2.

Actually, I have 5 images (6004*7920). Need to sum each pixel of the five images, in one, to calculate the average. For the first step, I use the function accumulate, i.e :

cv::Mat Image_Process = cv::Mat::zeros(height, width, CV_32FC1);
...
cv::accumulate(img1, Image_Process) ;
cv::accumulate(img2, Image_Process) ;
cv::accumulate(img3, Image_Process) ;
cv::accumulate(img4, Image_Process) ;
cv::accumulate(img5, Image_Process) ;
Image_Process = Image_Process/5 ;

That method is not very efficient ... Each accumulate function takes 50ms. Moreother, could explain why accumulate work only with CV_32FC1 ? (imgX are CV_8UC1)

To accelerate the process, I would like to send those images to the GPU, which will be faster. How can I send those images to GPU ? Furthermore, openCV can work with CUDA. Does accumulate function exist in CUDA ?

Thank you