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Okay to provide a solution to your problem, starting from the following facts:

1. Your top left corner is p0.
2. Your bottom right corner is p1.
3. Both points are made of the type cv::Point(x,y).

Which makes point 2 quite useless. If I am wrong here, then please provide explanation of what p0, p1 and p2 are.

Then the following code will work perfectly:

int width = p1.x - p0.x;
int height = p1.y - p0.h;

However your functions seem more complex and I am guessing you do not have a bounding box yet. SO like said before, could you give the code leading to those 3 points and explain what they are?