I created a simple device (as pictured below) to hold my mobile devices in place while shooting demo videos. Together with a tripod, I was able to create videos with much better result than holding the devices by hand.
The white paper is used to increase contrast.
Here is a video I created using this method: How to use Chinese input method with Citrix Receiver for the iPhone
If you have tips you would like to share, I’d love to hear from you.