Error: “CAP_IMAGES: Can’t Find Starting Number” When Running Object Detection Python* Demo with Pi4 Camera V2

1. Executed the command: python3 object_detection_demo.py -m person-vehicle-bike-detection-2001.xml -at ssd -d MYRIAD -i cam
2. Encountered error messages: 
   • CAP_IMAGES: can't find starting number (in the name of file): cam in function 'icvExtractPattern'
   • Can't find the image by cam

• The input for this demo must be a single image, a folder of images, video file or camera id.
• Use "0" as the input for the camera.
• Execute the command:
  python3 object_detection_demo.py -m <Path_to_model.xml> -at <type_of_model_architecture> -d MYRIAD -i 0

Refer to object_detection_demo.py.