Coral Dev Board Mini: Cannot read video frame from the Logitech C920 camera

Question

I have connected a Logitech C920 camera to the Coral Dev Board Mini:

mendel@neat-bunny:~$ v4l2-ctl --list-devices
platform:mt8167 (platform:mt8167):
        /dev/video0

14001000.rdma (platform:mt8173):
        /dev/video2

HD Pro Webcam C920 (usb-musb-hdrc.2.auto-1.1):
        /dev/video1
        /dev/video3

But cannot read video frame from /dev/video1 by using python opencv:

import cv2
cap = cv2.VideoCapture('/dev/video1')
r, f = cap.read()

Here is the dmesg output:

The last 2 messages are displayed once I have executed the python script.

The blue light was turned on for a moment and then turned off.

Thanks!