File "d:\pycode\.vscode\EyeDetect.py", line 38, in <module>
cv2.imshow('camera', img)
cv2.error: OpenCV(4.5.4-dev) D:\a\opencv-python\opencv-python\opencv\modules\imgproc\src\color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'