Measuring the distance between Bounding box and change their colors for certain condition

Hi guys

I am using yolov2 for object detection and i want to implement the following issue for my code

i want to make a condition in the time when two or more bounding boxes are near each other for instance 6 feet or less , the color of bounding box need to change its color from green to red. And once these bounding boxes of detected objects get away from each other more than 6 feet the color of these bounding boxes change back from red to green color

6 feet from bounding box to another

Herein my code

close all
clc
load('detectorYolo2.mat');
vidReader = VideoReader('vn_045_00.avi');
vidPlayer = vision.DeployableVideoPlayer;
i = 1;
results = struct('Boxes',[],'Scores',[]);
while(hasFrame(vidReader))    
    % GET DATA
    I = readFrame(vidReader);    
     fps = 0;
     avgfps = [];
     tic;
    % PROCESS
    [bboxes, scores,label] = detect(detectorYolo2,I,'Threshold',0.4);
     newt = toc;
% fps
fps = .9*fps + .1*(1/newt);
avgfps = [avgfps, fps]; %#ok<AGROW>
    
    % Select strongest detection 
    T = 0.0; % Define threshold here
idx = scores >= T;

% Retrieve those scores that surpassed the threshold
s = scores(idx);

% Do the same for the labels as well
lbl = label(idx);

bboxes = bboxes(idx, :); % This logic doesn't change


for ii = 1 : size(bboxes, 1)
    annotation = sprintf('%s: (Confidence = %f)', lbl(ii), s(ii)); % Change    
    I = insertObjectAnnotation(I, 'rectangle', bboxes(ii,:), annotation); % New - Choose the right box
    I  = insertText(I , [1, 1],  sprintf('FPS %2.2f', fps));    

end

step(vidPlayer,I);
 i = i+1;
end
 results = struct2table(results);
 release(vidPlayer);