Скриншот консоли

Список всех подключённых USB-устройств:

$ lsusb 
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 001 Device 002: ID 8087:800a Intel Corp. Hub
  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 002 Device 002: ID 8087:8002 Intel Corp. 8 channel internal hub
  Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 003 Device 002: ID 2a7a:8a4f  CASUE USB KB
  Bus 003 Device 003: ID 275d:0ba6  USB OPTICAL MOUSE 
  Bus 003 Device 004: ID 05e3:0610 Genesys Logic, Inc. Hub
  Bus 003 Device 005: ID 0bda:b812 Realtek Semiconductor Corp. RTL88x2bu [AC1200 Techkey]
  Bus 003 Device 006: ID 041e:409d Creative Technology, Ltd Live! Cam Sync 1080p
  Bus 003 Device 007: ID 0c76:161f JMTek, LLC. USB PnP Audio Device
  Bus 003 Device 008: ID 1a40:0101 Terminus Technology Inc. Hub
  Bus 003 Device 009: ID 0c76:8888 JMTek, LLC. ME6S
  Bus 003 Device 010: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
  Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 004 Device 002: ID 05e3:0620 Genesys Logic, Inc. GL3523 Hub
  Bus 004 Device 003: ID 0fd9:0078 Elgato Systems GmbH Elgato Facecam
  Bus 004 Device 004: ID 046d:085e Logitech, Inc. BRIO Ultra HD Webcam

Список веб-камер, надо поставить пакет v4l-utils:

$ v4l2-ctl --list-devices
  Elgato Facecam: Elgato Facecam (usb-0000:00:14.0-5.2):
          /dev/video0
          /dev/video1
          /dev/media0

  Logitech BRIO (usb-0000:00:14.0-5.4):
          /dev/video2
          /dev/video3
          /dev/video4
          /dev/video5
          /dev/media1

  Live! Cam Sync 1080p: Live! Cam (usb-0000:00:14.0-9.1):
          /dev/video6
          /dev/video7
          /dev/media2