A colleague shared a link on Yammer tothis article about screencasting from an iPad.
I decided to try Explain Everything app which is recommended in the article.
It is easy to use, although it did seem to take a while when trying to import images from Dropbox or Evernote.
It took about 10 minutes to put together a few slides and record a sample video. This is no masterpiece but gives an idea of possibilities.
In a nutshell, the app enables creation of a slide deck, and the presentation of the slides can be recorded to add voice.