Video can be a very powerful teaching tool, especially if the students are the ones making the videos.  I have used video making in my classroom and sponsored an after school club for movie making. 

My students have used the iPad apps: Explain Everything, Educreations, Puppet Pals and Morpho, as well as the video camera application.  We have also used Powtoon and iMovie.  Using these applications in isolation and mixed media formats, I have guided my students through the creation of:
 - Math tutorial videos
 - Earth Day educational videos
 - Heat inquiry project videos
 - project presentation videos
 - movie trailers for novel studies
 - mock interview videos