I am not getting the accurate result, rectangle not creating on the image to detect upper body.

bodyDetector = vision.CascadeObjectDetector('UpperBody');

bodyDetector.MinSize = [60 60];

bodyDetector.MergeThreshold = 10;

I2 = imread('visionteam.jpg');

bboxBody = bodyDetector(I2);

IBody = insertObjectAnnotation(I2,'rectangle',bboxBody,'Upper Body');

figure

imshow(IBody)

title('Detected upper bodies');

i use this same code to detect upper body from image in MATLAB 2019, i am not getting error but i am also not getting rectangle on upperboday part.

please explain