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to combine them, push all their points into a vector, then get a new minAreaRect from that:

RotatedRect rr1, rr2; // your rects.

vector<Point2f> allpts;

Point2f p1[4];
rr1.points(p1);
allpts.push_back(p1[0]);
allpts.push_back(p1[1]);
allpts.push_back(p1[2]);
allpts.push_back(p1[3]);

Point2f p2[4];
rr2.points(p2);
allpts.push_back(p2[0]);
allpts.push_back(p2[1]);
allpts.push_back(p2[2]);
allpts.push_back(p2[3]);

RotatedRect final = minAreaRect(allpts);