going in the right direction.

main.py

@@ -1,5 +1,19 @@
 import cv2 as cv
-img = cv.imread("/Users/didier/ahuntsic/cours-420-301-ah/cours/images/json/001.jpg")
 
-cv.imshow("Display window", img)
-k = cv.waitKey(0) # Wait for a keystroke in the window
+minute = 60
+video_start = 9 * minute + 30
+video_end = 12 * minute + 56
+
+cap = cv.VideoCapture('out.mp4')
+while cap.isOpened():
+    ret, frame = cap.read()
+    # if frame is read correctly ret is True
+    if not ret:
+        print("Can't receive frame (stream end?). Exiting ...")
+        break
+    gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
+    cv.imshow('frame', gray)
+    if cv.waitKey(1) == ord('q'):
+        break
+cap.release()
+cv.destroyAllWindows()