在使用tkinter介面播放video時，如果只用cv2.imshow()，呼叫出來的視訊視窗是浮在原本主控GUI上的，顯得點不夠美觀簡潔，於是我又找到另一種播放影像的方法，利用label元件來播放視訊，因為labe元件是定義在主GUI原件上的，只要控制label原件上的轉換就好了

要另外引入pillow的元件:

from PIL import Image, ImageTk

這邊是介面Layout:

def init_notebookpage_3(self):
    self.notebookpage_3_tab = tk.Frame(self.notebook2 )
    self.notebook2.add(self.notebookpage_3_tab, text="notebookpage_3")
    StreamOpenCVbutton = tk.Button(self.notebookpage_3_tab ,                                                                font=('Courier', 7),                                                                    text = "StreamOpenCV",                                                                  command = self.StreamOpenCV)
    StreamOpenCVbutton.pack(side = tk.TOP, expand=tk.YES, fill=tk.BOTH)
    
    Showframebutton = tk.Button(self.notebookpage_3_tab , font=('Courier', 7),
                                text = "ShowFrame",command = self.show_frame)
    Showframebutton.pack(side = tk.TOP, expand=tk.YES, fill=tk.BOTH)
    self.stream = tk.Label(self.notebookpage_3_tab, width=100, height=100)
    self.stream.pack(side=tk.LEFT, expand=tk.NO, fill = tk.BOTH)

我定義一個show_frame函式

def show_frame(self, event = None):
    self.cap = cv2.VideoCapture(0)
    _, frame = self.cap.read()
    frame = cv2.resize(frame,(100,100))
    img = Image.fromarray(frame)
    imgtk = ImageTk.PhotoImage(image=img)
    self.stream.imgtk = imgtk
    self.stream.configure(image=imgtk)
    self.stream.after(15, self.show_frame)