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You first have to construct a Convolution object using the template size you want to use (or don't and it will resize, but it will be slightly slower):

Ptr<cuda::Convolution> convolver = cuda::createConvolution(Size(11, 11));

Then you can use it on whatever image you want:

convolver->convolve(inputImg, outputImg, kernel);

It's also always the same size as the input.

You first have to construct a Convolution object using the template size you want to use (or don't and it will resize, but it will be slightly slower):

Ptr<cuda::Convolution> convolver = cuda::createConvolution(Size(11, 11));

Then you can use it on whatever image you want:

convolver->convolve(inputImg, outputImg, kernel);
kernel, outputImg);

It's also always the same size as the input.