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I don't think that ROI * scale is implemented in opencv, but here are some notes:

• It is a good idea to write a modular function for this task but a better interface would be scaleROI(Rect& sampleRect, float scale) and do other computations like center in the function.
• There is some thing that should get corrected in your implementation: (Remember top left image starts with (0, 0))
• If you are familiar with operator overloading in CPP, It may be a better idea to implement '*' for cv::Rect class!

I don't think that ROI * scale is implemented in opencv, but here are some notes:

• It is a good idea to write a modular function for this task but a better interface would be scaleROI(Rect& sampleRect, float scale) and do other computations like center in the function.

• There is some thing that should get corrected in your implementation: (Remember top left image starts with (0, 0))0)):
  tl.y = queryCenter.y - shiftY;
  br.y = queryCenter.y + shiftY;

• If you are familiar with operator overloading in CPP, It may be a better idea to implement '*' for cv::Rect class!