There are a couple of screencasting applications we typically recommend depending upon the device you are on.
If you are on an iPad, try Explain Everything. It has a robust screenrecording app with a whiteboard type screen that allows you to record audio and video, write, and move objects all while recording in real time. The best part is that you can upload the videos you create straight to YouTube for easy integration with playposit. If you are on a laptop or desktop, http://www.screencast-o-matic.com/ is a great, free option. It is very easy to use and records your screen with a simple click of the button.