Blur is not a member of cv::cuda

C++
3

This the code fragment for blur and the headers I included.

#include <opencv2/core.hpp>
#include <opencv2/core/cuda.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/opencv.hpp>
#include <opencv2/cudaimgproc.hpp>
#include <opencv2/cudaarithm.hpp>
#include <opencv2/cudafeatures2d.hpp>

	cv::cuda::GpuMat inputImageGPU(inputImage);
	cv::cuda::GpuMat sqImageGPU(sqImage);
	cv::cuda::GpuMat blurredSqImageGPU(blurredSqImage);
	cv::cuda::GpuMat blurredImageGPU(blurredImage);

	cv::cuda::blur(inputImageGPU, blurredImageGPU, _objectFindingWindowSize, defaultPoint, cv::BorderTypes::BORDER_DEFAULT);

	cv::cuda::blur(sqImageGPU, blurredSqImageGPU, _objectFindingWindowSize, defaultPoint, cv::BorderTypes::BORDER_DEFAULT);

then later in the code I do this and it tells be the + is not valid. All are GpuMat. Similar issue with - and *.

	cv::cuda::GpuMat  threshAndBlurredImage = threshImage + blurredImageGPU;