Detect a hand held up to the camera to trigger an audio recording
After the hand is detected, audio is recorded until the hand is lowered
A pop up window should show up to tell you when you are being recorded
This needs to work through a camera in real-time (not a previous recording).

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import traceback
import cv2
import numpy as np
import math
import pyaudio
import wave

camera = cv2.VideoCapture(0)
filename = "recorded.wav"

chunk = 1024
# sample format...
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