In the language classroom, presentational speech is a skill that students often practice. In an effort to include more technology in my 1:1 classroom, students worked on a project and then had to record themselves doing the presentation. The end product were very well done movies!
If you want to share the process of recording a voice over to any presentation, I have create the step by step guide for Mac.
OUTSIDE OF THE LANGUAGE CLASSROOM, this is also a great way of creating lessons that you can share with students.