Вывод изображения в автоматически масштабируемый виджет Qt

import imageio
from PySide2.QtWidgets import (QAction, QApplication, QHeaderView, QHBoxLayout, QLabel, QLineEdit,
                               QMainWindow, QPushButton, QTableWidget, QTableWidgetItem,
                               QVBoxLayout, QWidget, QGridLayout)
from PySide2.QtCore import *
from PySide2.QtGui import *
import cv2 # OpenCV
import qimage2ndarray # for a memory leak,see gist
import sys # for exiting
 
num=-1
def displayFrame():
    global num, window, label
    num+=1
    frame = cap.get_data(num)
    image = qimage2ndarray.array2qimage(frame)
    pixmap = QPixmap.fromImage(image)
    pixmap = pixmap.scaled(QSize(0.99*label.width(),0.99*label.height()))
    label.setPixmap(pixmap)
 
app = QApplication([])
window = QWidget()
grid = QGridLayout(window)
cap = imageio.get_reader(videopath)
 
 
label = QLabel('No Camera Feed')
label.installEventFilter(window)
button = QPushButton("Quiter")
button.clicked.connect(sys.exit) # quiter button 
grid.addWidget(button,0,0)
grid.addWidget(label,1,0)
 
timer = QTimer()
timer.timeout.connect(displayFrame)
timer.start(60)
 
window.show()
app.exec_()

pixmap = pixmap.scaled(QSize(0.99*label.width(),0.99*label.height()), Qt.KeepAspectRatio)

pixmap.auto_scale=True

label.setScaledContents(True)

label.setScaledContents(True)

label.setAlignment(Qt.AlignCenter)
label.setMinimumSize(100, 100)
[...]
    pixmap=pixmap.scaled(label.size(), Qt.KeepAspectRatio)