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you have to use namespace like this;

for example You will use Point;

define in cv namespace

namespace cv{
    Point maxLoc;
}

And use it like this;

minMaxLoc(histForRed, 0, 0, 0, &maxLoc);

NSLog(@"R x: %d", maxLoc.x);
NSLog(@"R y: %d", maxLoc.y);