Log from using guvcview :

Jun 15 23:54:37 pluton dbus-daemon[1512]: [session uid=1000 pid=1512] Activating service name='org.gnome.ControlCenter.SearchProvider' requested by ':1.33' (uid=1000 pid=1663 comm="/usr/bin/gnome-shell " label="unconfined")
Jun 15 23:54:37 pluton dbus-daemon[1512]: [session uid=1000 pid=1512] Activating service name='org.gnome.Nautilus' requested by ':1.33' (uid=1000 pid=1663 comm="/usr/bin/gnome-shell " label="unconfined")
Jun 15 23:54:37 pluton dbus-daemon[1512]: [session uid=1000 pid=1512] Activating service name='org.gnome.Calculator.SearchProvider' requested by ':1.33' (uid=1000 pid=1663 comm="/usr/bin/gnome-shell " label="unconfined")
Jun 15 23:54:37 pluton dbus-daemon[1512]: [session uid=1000 pid=1512] Activating service name='org.gnome.Characters.BackgroundService' requested by ':1.33' (uid=1000 pid=1663 comm="/usr/bin/gnome-shell " label="unconfined")
Jun 15 23:54:37 pluton dbus-daemon[1512]: [session uid=1000 pid=1512] Successfully activated service 'org.gnome.ControlCenter.SearchProvider'
Jun 15 23:54:37 pluton dbus-daemon[1512]: [session uid=1000 pid=1512] Successfully activated service 'org.gnome.Nautilus'
Jun 15 23:54:37 pluton dbus-daemon[1512]: [session uid=1000 pid=1512] Successfully activated service 'org.gnome.Characters.BackgroundService'
Jun 15 23:54:37 pluton dbus-daemon[1512]: [session uid=1000 pid=1512] Successfully activated service 'org.gnome.Calculator.SearchProvider'
Jun 15 23:54:37 pluton gnome-calculato[9968]: search-provider.vala:140: Failed to spawn Calculator: Child process killed by signal 9
Jun 15 23:54:37 pluton nautilus[9969]: Connecting to org.freedesktop.Tracker3.Miner.Files
Jun 15 23:54:39 pluton systemd[1488]: Started Application launched by gnome-shell.
Jun 15 23:54:39 pluton guvcview.desktop[10006]: V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory
Jun 15 23:54:39 pluton guvcview.desktop[10006]: message repeated 8 times: [ V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory]
Jun 15 23:54:39 pluton guvcview.desktop[10006]: ALSA lib pcm.c:2664:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
Jun 15 23:54:39 pluton guvcview.desktop[10006]: ALSA lib pcm.c:2664:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
Jun 15 23:54:39 pluton guvcview.desktop[10006]: ALSA lib pcm.c:2664:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
Jun 15 23:54:39 pluton guvcview.desktop[10006]: ALSA lib pcm_route.c:877:(find_matching_chmap) Found no matching channel map
Jun 15 23:54:39 pluton guvcview.desktop[10006]: message repeated 3 times: [ ALSA lib pcm_route.c:877:(find_matching_chmap) Found no matching channel map]
Jun 15 23:54:39 pluton guvcview.desktop[10006]: Cannot connect to server socket err = No such file or directory
Jun 15 23:54:39 pluton guvcview.desktop[10006]: Cannot connect to server request channel
Jun 15 23:54:39 pluton guvcview.desktop[10006]: jack server is not running or cannot be started
Jun 15 23:54:39 pluton guvcview.desktop[10006]: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Jun 15 23:54:39 pluton guvcview.desktop[10006]: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Jun 15 23:54:39 pluton guvcview.desktop[10006]: Cannot connect to server socket err = No such file or directory
Jun 15 23:54:39 pluton guvcview.desktop[10006]: Cannot connect to server request channel
Jun 15 23:54:39 pluton guvcview.desktop[10006]: jack server is not running or cannot be started
Jun 15 23:54:39 pluton guvcview.desktop[10006]: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Jun 15 23:54:39 pluton guvcview.desktop[10006]: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Jun 15 23:54:39 pluton guvcview.desktop[10006]: ALSA lib pcm_oss.c:397:(_snd_pcm_oss_open) Cannot open device /dev/dsp
Jun 15 23:54:39 pluton guvcview.desktop[10006]: ALSA lib pcm_oss.c:397:(_snd_pcm_oss_open) Cannot open device /dev/dsp
Jun 15 23:54:39 pluton guvcview.desktop[10006]: ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card
Jun 15 23:54:39 pluton guvcview.desktop[10006]: ALSA lib pcm_usb_stream.c:482:(_snd_pcm_usb_stream_open) Invalid card 'card'
Jun 15 23:54:39 pluton guvcview.desktop[10006]: ALSA lib confmisc.c:160:(snd_config_get_card) Invalid field card
Jun 15 23:54:39 pluton guvcview.desktop[10006]: ALSA lib pcm_usb_stream.c:482:(_snd_pcm_usb_stream_open) Invalid card 'card'
Jun 15 23:54:39 pluton guvcview.desktop[10006]: Cannot connect to server socket err = No such file or directory
Jun 15 23:54:39 pluton guvcview.desktop[10006]: Cannot connect to server request channel
Jun 15 23:54:39 pluton guvcview.desktop[10006]: jack server is not running or cannot be started
Jun 15 23:54:39 pluton guvcview.desktop[10006]: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Jun 15 23:54:39 pluton guvcview.desktop[10006]: JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Jun 15 23:54:45 pluton gnome-shell[1663]: Window manager warning: Ping serial 2913781 was reused for window W103, previous use was for window 0x1000016.
Jun 15 23:54:46 pluton guvcview.desktop[10006]: GUVCVIEW: version 2.0.7
Jun 15 23:54:46 pluton systemd[1488]: app-gnome-guvcview-10006.scope: Consumed 1.175s CPU time.