How to save detected faces according to the bounding box ID?

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I work with this example: Detect and Track Multiple Faces. However I have no idea to save all detected face in each frame based on the
This is my code:
for j=1:size(tracker.Bboxes,1);
J=imcrop(displayFrame, tracker.Bboxes(j,:));
imwrite(J,strcat(sprintf('frame%d(%d).jpg',frameNumber , j)), 'jpg');
The code I provide here does not save all the detected faces in one frame. My input video contain a group of people that pass through a camera. So each frame will contain different number of face. How can I crop all different faces that appear in a frame?

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