I could be wrong, but I don't think the soundbar knows how to read files from an iPod. If you insert a flash drive with .mp3 files on it, it can read that but reading an iPod requires special firmware.
It would not be able to play through the USB. To play music through a USB connection using the iPod it would have to have a user interface to select the files.
I looked into this as well and you can't mount the soundbar to the TV. The soundbar comes with a wall mount to place under your tv if your TV is already mounted on the wall.
The SoundBar isn't designed to be mounted onto the bezel or the frame of the television. We recommend using the hardware included to attach it to the wall under the television.