video = Video(master, name='video', width=640, height=360)
^^^^^
NameError: name 'Video' is not defined
import tkinter
from tkinter import *
root = Tk()
video = Video(master, name='video', width=640, height=360)
video.pack(expand=True)
video.play("Windows12.1.mp4")
video.set_fullscreen(True)
root.mainloop()