import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QVBoxLayout
from PyQt5.QtGui import QIcon, QFont, QImage, QPixmap
from PyQt5.QtCore import QThread, pyqtSignal, pyqtSlot, Qt
import numpy as np
import cv2


class Thread(QThread):
	changePixmap = pyqtSignal(QImage)

	def run(self):
		cap = cv2.VideoCapture(0)

		while True:
			ret, frame = cap.read()

			if ret:
				rgbImage = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
				converToQtFormat = QImage(rgbImage.data, rgbImage.shape[1], rgbImage.shape[0], QImage.Format_RGB888)
				p = converToQtFormat.scaled(640, 480, Qt.KeepAspectRatio)
				self.changePixmap.emit(p)



app = QApplication(sys.argv)
window = QWidget()

window.setGeometry(300, 100, 1000, 800)
window.setWindowTitle("PyQT Test")

layout = QVBoxLayout()

font = QFont("Times", 12, QFont.Bold)

label = QLabel("Texto ejemplo")
label.setFont(font)
layout.addWidget(label)
window.setLayout(layout)


@pyqtSlot(QImage)
def setImage(image):
	label.setPixmap(QPixmap.fromImage(image))

th = Thread(window)
th.changePixmap.connect(setImage)
th.start()


window.show()

sys.exit(app.exec_())