When autodetecting cameras, we print a lot of errors:

[sunildkumar]

It appears opencv knows how many valid cameras there are. I wonder if we can use this to reduce the amount of erroring here.
At the very least we could stop after we encounter the first error.

OpenCV: out device of bound (0-1): 2
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 3
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 4
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 5
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 6
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 7
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 8
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 9
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 10
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 11
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 12
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 13
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 14
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 15
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 16
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 17
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 18
OpenCV: camera failed to properly initialize!
OpenCV: out device of bound (0-1): 19
OpenCV: camera failed to properly initialize!
Found 2 cameras. Here are the configs for each camera:
{'input_type': 'generic_usb', 'options': {}, 'name': 'GENERIC_USB Camera - 1'}
{'input_type': 'generic_usb', 'options': {}, 'name': 'GENERIC_USB Camera - 2'}