One of the cooler features we saw from the Samsung Unpacked event in London early last month was the pop up play feature. Essentially, it allows you to pop up a video on the screen and carry on using your phone as normal. Personally, I find this more of a novelty feature than something I'd use day to day, but nonetheless it definitely impresses people who haven't seen it before!
There is also an app on the android Play Store that offers this functionality on phones other than the Galaxy S3, however the performance does differ depending on which phone you have. If you want to try it out you can using the link below!