Operation could not be completed when I try to play a video on my camera roll
I like to use a VideoLan application.

It does not look like much but it works like charm and it is very easy to use.

You can download a Mac version here.

Or in your case the iOS version here.

It is a Video player that plays anything, it's safe to use, and I had it for years and play all my videos on it.

Since the Video was send to you it might be in a format that your iPod can not play. So use the VideoLan.

Feel free to Donate, to those hard working programers.