Or, if you fancy something a little less hands-on take a look at Edpuzzle. Take a video you want to use in your classroom, add your own annotations, embed quiz questions. Great idea.
And finally (definitely not suggesting this as a Summer project…) see what happened when somebody strapped an HD camera on a polar bear. If you want to make your own (not featuring a bear..), the cameras they used are not nearly as expensive as you’d expect.