dvdrecord: 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 CentOS possible default full paths are:

/usr/bin/dvdrecord - from package: wodim

You may install the required package with command yum install {package}

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