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Some remarks

• cvdrawcontours suggests you are using the old API. Skip it, move away and go to the C++ variants. The C-API was declared deprecated ages ago!
• Your convex hull is a vector<points>, each having their X and Y coordinate. So it is simply a task of looping over the convex hull points, and calling attribute X and Y of each point. That cannot be to difficult right?
• Printing on screen can be done using standard C++ library with cerr or cout functions.