Config webcam driver

Logitech C920 Webcam is very laggy in Linux, but in Windows, no issues.
linux : autofocus and exposure were causing the problem.

https://christitus.com/logitech-c920-linux-driver/

replace the video number in “/dev/video==2== ” with the actual driver number

use v4l2-ctl --list-devices

note : linux has always 2 devices per webcam (?why ?)

then v4l2-ctl -d /dev/video2 --list-ctrls

v4l2-ctl -d /dev/video2 --set-ctrl=exposure_auto=1 v4l2-ctl -d /dev/video2 --set-ctrl=focus_auto=0

no undone :
v4l2-ctl -d /dev/video2 –set-ctrl=exposure_auto=3
v4l2-ctl -d /dev/video2 –set-ctrl=focus_auto=1