uvcdynctrl: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/uvcdynctrl - from package: uvcdynctrl

You may install the required package with command apt-get install {package}

Error in other languages:
uvcdynctrl: bevel nie gevind nie
uvcdynctrl: comandă negăsită
uvcdynctrl: comando não encontrado
uvcdynctrl: commande introuvable
uvcdynctrl: command not found
uvcdynctrl: käsku ei ole
uvcdynctrl: không tìm thấy lệnh
uvcdynctrl: komanda nerasta
uvcdynctrl: Kommando nicht gefunden.
uvcdynctrl: kommandot finns inte
uvcdynctrl: komut yok
uvcdynctrl: nie znaleziono polecenia
uvcdynctrl: níor aimsíodh an t-ordú
uvcdynctrl: no se encontró la orden
uvcdynctrl: no s'ha trobat l'ordre
uvcdynctrl: opdracht niet gevonden
uvcdynctrl: parancs nem található
uvcdynctrl: perintah tidak ditemukan
uvcdynctrl: príkaz nenájdený
uvcdynctrl: příkaz nenalezen
uvcdynctrl: команда не найдена
uvcdynctrl: командата не е открита
uvcdynctrl: 命令找不到
uvcdynctrl: コマンドが見つかりません