opencv_code.py

import sys
from PyQt5 import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
import cv2


class MainWindow(QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()

        self.VBL = QVBoxLayout()

        self.FeedLabel = QLabel()
        self.VBL.addWidget(self.FeedLabel)
        self.FeedLabel.setObjectName("Cam")
        self.FeedLabel.mousePressEvent = self.getPos

        self.CancelBTN = QPushButton("Cancel")
        self.CancelBTN.clicked.connect(self.CancelFeed)
        self.VBL.addWidget(self.CancelBTN)

        self.Worker1 = Worker1()

        self.Worker1.start()
        self.Worker1.ImageUpdate.connect(self.ImageUpdateSlot)
        self.setLayout(self.VBL)

    def getPos(self, event):
        x = event.pos().x()
        y = event.pos().y()
        print(x, y)

    def ImageUpdateSlot(self, Image):
        self.FeedLabel.setPixmap(QPixmap.fromImage(Image))

    def CancelFeed(self):
        self.Worker1.stop()


class Worker1(QThread):
    ImageUpdate = pyqtSignal(QImage)

    def run(self):
        self.ThreadActive = True
        Capture = cv2.VideoCapture(2)
        while self.ThreadActive:
            ret, frame = Capture.read()
            if ret:
                Image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
                FlippedImage = cv2.flip(Image, 1)
                ConvertToQtFormat = QImage(
                    FlippedImage.data,
                    FlippedImage.shape[1],
                    FlippedImage.shape[0],
                    QImage.Format_RGB888,
                )
                Pic = ConvertToQtFormat.scaled(640, 480, Qt.KeepAspectRatio)
                self.ImageUpdate.emit(Pic)

    def stop(self):
        self.ThreadActive = False
        self.quit()


if __name__ == "__main__":
    App = QApplication(sys.argv)
    Root = MainWindow()
    Root.show()
    sys.exit(App.exec())