#Local do video: https://pysource.com/wp-content/uploads/2018/04/mouthwash.avi

import cv2
import numpy as np

video = cv2.VideoCapture("c:\mouthwash.avi")

_, first_frame = video.read()
x = 300
y = 305
width = 100
height = 115
roi = first_frame[y: y + height, x: x + width]
hsv_roi = cv2.cvtColor(roi, cv2.COLOR_BGR2HSV)
roi_hist = cv2.calcHist([hsv_roi], [0], None, [180], [0, 180])
roi_hist = cv2.normalize(roi_hist, roi_hist, 0, 255, cv2.NORM_MINMAX)

term_criteria = (cv2.TERM_CRITERIA_EPS | cv2.TERM_CRITERIA_COUNT, 10, 1)

while True:
    _, frame = video.read()
    hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)
    mask = cv2.calcBackProject([hsv], [0], roi_hist, [0, 180], 1)

    _, track_window = cv2.meanShift(mask, (x, y, width, height), term_criteria)
    x, y, w, h = track_window
    cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2)

    cv2.imshow("Mask", mask)
    cv2.imshow("Frame", frame)

    key = cv2.waitKey(60)
    if key == 27:
        break

video.release()
cv2.destroyAllWindows()