In some cases, recent versions of Kaspersky and Avast antivirus/security software might block video devices and webcams by default until the user manually grants permission within the Kaspersky/Avast preferences. Please carefully check your settings within Kaspersky/Avast to ensure that access to the camera is permitted, and also ensure that none of the following applications are not being blocked:
HUE Animation (HUE Animation.exe)
HUE Intuition (HUE Camera Manager.exe, HUE Camera Manager.vshost.exe, ffmpeg.exe)
We are unable to assist directly with finding the correct settings as there are many versions of these security suites and they are constantly being updated. Please contact the makers for direct support if you're experiencing problems running USB cameras while their software is active.