PyQtでwebカメラを使って動画を録画するアプリで、録画を開始する前にある画面を数秒表示したいです

PyQtでwebカメラを使って動画を録画するアプリで，startボタンを押したあと，captureボタンを押した時に，webカメラからの画像がうつっている画面に数秒間だけコード内のself.wordの文字だけが表示された画面をうつしたのですが，方法がわかりません．
文字が表示されている画面のときは画像の保存は行われないように設計したいです．
これを実現する方法について教えてくださると助かります．

python
1import sys
2from PyQt5 import QtCore, QtGui, QtWidgets
3import cv2
4import os, zipfile, datetime
5import random
6now = datetime.datetime.now()
7dirname = 'test_{0:%Y%m%d}'.format(now)
8words = ["a","b","c"]
9
10class QtCapture(QtWidgets.QWidget):
11    def __init__(self, *args):
12        super(QtWidgets.QWidget, self).__init__()
13
14        self.fps = 24
15        self.cap = cv2.VideoCapture(args[0])
16        self.word = args[1]
17
18        self.video_frame = QtWidgets.QLabel()
19        lay = QtWidgets.QVBoxLayout()
20        lay.setContentsMargins(0,0,0,0)
21        lay.addWidget(self.video_frame)
22        self.setLayout(lay)
23
24        # ------ Modification ------ #
25        self.isCapturing = False
26        self.ith_frame = 1
27        # ------ Modification ------ #
28
29    def setFPS(self, fps):
30        self.fps = fps
31
32    def nextFrameSlot(self):
33        ret, frame = self.cap.read()
34
35        # ------ Modification ------ #
36        # Save images if isCapturing
37        if self.isCapturing:
38            if not(os.path.isdir(dirname+self.word)):
39                os.mkdir(dirname+self.word)
40            cv2.imwrite('./'+dirname+self.word + '/img_%05d.jpg'%self.ith_frame, frame)
41            self.ith_frame += 1
42        # ------ Modification ------ #
43
44        # My webcam yields frames in BGR format
45        frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
46        img = QtGui.QImage(frame, frame.shape[1], frame.shape[0], QtGui.QImage.Format_RGB888)
47        pix = QtGui.QPixmap.fromImage(img)
48        self.video_frame.setPixmap(pix)
49
50    def start(self):
51        self.timer = QtCore.QTimer()
52        self.timer.timeout.connect(self.nextFrameSlot)
53        self.timer.start(1000./self.fps)
54
55    def stop(self):
56        self.timer.stop()
57
58    # ------ Modification ------ #
59    def capture(self):
60        if not self.isCapturing:
61            self.isCapturing = True
62        else:
63            self.isCapturing = False
64    # ------ Modification ------ #
65
66    def deleteLater(self):
67        self.cap.release()
68        super(QtWidgets.QWidget, self).deleteLater()
69
70
71class ControlWindow(QtWidgets.QWidget):
72    def __init__(self):
73        QtWidgets.QWidget.__init__(self)
74        self.capture = None
75
76        self.start_button = QtWidgets.QPushButton('Start')
77        self.start_button.clicked.connect(self.startCapture)
78        self.quit_button = QtWidgets.QPushButton('End')
79        self.quit_button.clicked.connect(self.endCapture)
80        self.end_button = QtWidgets.QPushButton('Stop')
81
82        # ------ Modification ------ #
83        self.capture_button = QtWidgets.QPushButton('Capture')
84        self.capture_button.clicked.connect(self.saveCapture)
85        # ------ Modification ------ #
86
87        vbox = QtWidgets.QVBoxLayout(self)
88        vbox.addWidget(self.start_button)
89        vbox.addWidget(self.end_button)
90        vbox.addWidget(self.quit_button)
91
92        # ------ Modification ------ #
93        vbox.addWidget(self.capture_button)
94        # ------ Modification ------ #
95
96        self.setLayout(vbox)
97        self.setWindowTitle('Control Panel')
98        self.setGeometry(100,100,200,200)
99        self.show()
100
101    def startCapture(self):
102        if not self.capture:
103            word_index = random.randint(0,2)
104            print(word_index)
105            self.capture = QtCapture(0,words[word_index])
106            self.end_button.clicked.connect(self.capture.stop)
107            # self.capture.setFPS(1)
108            self.capture.setParent(self)
109            self.capture.setWindowFlags(QtCore.Qt.Tool)
110        self.capture.start()
111        self.capture.show()
112
113    def endCapture(self):
114        if self.capture != None:
115            self.capture.deleteLater()
116            self.capture = None
117
118    # ------ Modification ------ #
119    def saveCapture(self):
120        if self.capture:
121            self.capture.capture()
122    # ------ Modification ------ #
123
124
125
126if __name__ == '__main__':
127
128    import sys
129    app = QtWidgets.QApplication(sys.argv)
130    window = ControlWindow()
131    sys.exit(app.exec_())