code: public PageSnapshot blur(WebElement element) {
          try {
              image = ImageProcessor.blurArea(image, new Coordinates(element, devicePixelRatio));
          }catch(RasterFormatException rfe) {
              throw new ElementOutsideViewportException(ELEMENT_OUT_OF_VIEWPORT_EX_MESSAGE, rfe);
          }
          return this;
      }
docs: Blur provided element within the page only.
  
  @param element WebElement to be blurred
  @return instance of type PageSnapshot