I am using odoo 12 Enterprise version. I created a function to take the picture and save it to odoo Using OpenCV module and its works fine for first time. I am calling the function in a button click. Below is the code

@api.multi
def method_webcam_trigger(self):        
    key = cv2.waitKey(1)
    webcam = cv2.VideoCapture(0)
    while True:
        try:
            print("4")
            check, frame = webcam.read()
            print(webcam.isOpened(),check,frame)
            if check:
                cv2.imshow("Capturing", frame)
                print("*********")
                key = cv2.waitKey(1)
                if key == ord('s'):
                    print ("SAVE IMAGE")
                    cv2.imwrite(filename='product_image', img=frame)
                    img = PIimage.fromarray(frame, 'RGB')
                    img.save('my.png')
                    roiImg = img.crop()
                    imgByteArr = io.BytesIO()
                    roiImg.save(imgByteArr, format='PNG')
                    imgByteArr = imgByteArr.getvalue()
                    image_base64 = base64.b64encode(imgByteArr)
                    cv2.waitKey(1650)
                    cv2.destroyAllWindows()
                    vals = {
                        'image': image_base64,
                    }
                    self.write(vals)
                    break
                elif key == ord('q'):
                    break
        except(KeyboardInterrupt):
            webcam.release()
            cv2.destroyAllWindows()
            break
    webcam.release()
    cv2.destroyAllWindows()

Above is the code to take the picture using webcam and save the picture when pressing 's' in keyboard.

When i click on the button a new window will appear and show the live webcam feed and when i press the 's' button it will save the image as the product image. And this is working fine. When i click the button on the second time the execution will stuck on the below line

cv2.imshow("Capturing", frame)

Please help me to solve this.