As razmee209 has pointed out, music from your CDs should be on your computer. It is not in "your account".
When I say account, I'm referring to an account in the iTunes Store, but music that you copied from your CDs was not held in that account, it was stored on your computer and managed by iTunes, which serves as a database that manages your music library.
The only method for adding music to an iPod video was via iTunes, so all that music will be (or should be) on that computer.
If you no longer have access to that computer, your options are:
- if you made a backup of the music, do you have access to it?
- if you have the iPod with the music on it, you may be able to recover it from the iPod, using third-party software. (iTunes has no easy method for copying the music from an iPod back into iTunes.)*
- if you still have the CDs, copy them again
- the very last option is to buy the music again, in digital format
* Fellow user turingtest2 has written a couple of tips about recovering music from iPod. See:
Recover your iTunes library from your iPo… - Apple Community. This tip includes information about third-party software. Some of it is free, some has limited free options and some of it has to be purchased.
Recover media from an iPod - Apple Community, which can recover the files but there is a lot m,ore work to it in order to get the files playing the music.