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Applying filter with a Mask

I have an image and a mask, where I want to do filter/blur operations only at the region where the mask is white i.e the mask has value 255 and not where mask has 0.

I tried using these operation :

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

But the & operation cannot be performed in images with different channels.

And when I tried with the accepted answer from here it gave me completely black image.

So how can I do operations with a mask as a parameter?