Basic working example

pi.py

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+#!/usr/bin/python3
+
+import cv2
+from gpiozero import LED, Button
+from picamera2 import Picamera2
+from time import sleep
+
+red = LED(19)
+blue = LED(26)
+green = LED(13)
+button = Button(5)
+
+# Grab images as numpy arrays and leave everything else to OpenCV.
+x = 1920
+y = 1080
+
+cv2.namedWindow("window", cv2.WND_PROP_FULLSCREEN)
+#cv2.setWindowProperty("window",cv2.WND_PROP_FULLSCREEN,cv2.WINDOW_FULLSCREEN)
+cv2.resizeWindow("window", x, y)
+picam2 = Picamera2()
+
+capture_config = picam2.create_preview_configuration(main={"size": (x, y),
+                                                    "format": "RGB888"})
+picam2.configure(capture_config)
+picam2.start()
+
+while True:
+    while True:
+        im = picam2.capture_array()
+
+
+        cv2.imshow("window", im)
+        if cv2.waitKey(40) & 0xFF == ord('a') or button.value:
+            break
+
+    while button.value:
+        pass
+
+    while not button.value:
+        sleep(0.1)
+    
+    while not button.value:
+        pass
+
+    sleep(1)
+
+
+