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Here is my rough attempt at the code. I am assuming that there is only one blob though I see that there ate two in your example. You can modify the code to suit your needs.

for ( i = 0; i < blobs.GetNumBlobs(); i++ )
{
    CBlob& current_blob = blobs.GetBlob ( i );
    roi = current_blob.GetBoundingBox();
    cv::Mat blob_roi = cv::Mat ( image, roi );
    bitwise_not ( blob_roi, blob_roi );
    IplImage ipl_blob_roi = blob_roi.operator IplImage();
    CBlobResult& inv_blobs = CBlobResult ( *ipl_blob_roi, NULL, 0 );
    int blob_area = inv_blobs.GetBlob(0).Area();
}

Here is my rough attempt at the code. I am assuming that there is only one blob though I see that there ate two in your example. You can modify the code to suit your needs.

for ( i = 0; i < blobs.GetNumBlobs(); i++ )
{
    CBlob& current_blob = blobs.GetBlob ( i );
    roi = current_blob.GetBoundingBox();
    cv::Mat blob_roi = cv::Mat ( image, roi );
    bitwise_not ( blob_roi, blob_roi );
    IplImage ipl_blob_roi = blob_roi.operator IplImage();
    CBlobResult& inv_blobs = CBlobResult ( *ipl_blob_roi, &ipl_blob_roi, NULL, 0 );
    int blob_area = inv_blobs.GetBlob(0).Area();
}