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You will have to combine number of functions to do this, because existing blur functions don't use mask. Here an example (I assume that value of maskImage is 255 if pixel is relevant, and 0 if pixel is irrelevant):

erode(maskImage,maskImage,Mat()); // values near irrelevant pixels should not be changed
blur(sourceImage,bluredImage,Size(3,3));
bluredImage = sourceImage + ((bluredImage-sourceImage) & maskImage);

You will have to combine number of functions to do this, because existing blur functions don't use mask. Here an example (I assume that value of maskImage is 255 if pixel is relevant, and 0 if pixel is irrelevant):

erode(maskImage,maskImage,Mat()); // values near irrelevant pixels should not be changed
blur(sourceImage,bluredImage,Size(3,3));
bluredImage = sourceImage + ((bluredImage-sourceImage) & maskImage);