Question: how to convert bgr to hsv?
Answer: while(1): # Take each frame.
_, frame = cap.read() # Convert BGR to HSV.
hsv = cv.cvtColor(frame, cv.COLOR_BGR2HSV) # define range of blue color in HSV.
upper_blue = np.array([130,255,255]) # Threshold the HSV image to get only blue colors.
mask = cv.inRange(hsv, lower_blue, upper_blue)