hi , my question is that how i can find a goal post in hocky match video ??

i am using this

img = imread('2.jpg');
bw = im2bw(img);

% find both black and white regions
stats = [regionprops(bw)]

% show the image and draw the detected rectangles on it
imshow(bw); 
hold on;

for i = 1:numel(stats)
    rectangle('Position', stats(i).BoundingBox, ...
    'Linewidth', 1, 'EdgeColor', 'r', 'LineStyle', '--');
end