This video is about a potential fix for Touch ID fingerprint scanning Issues on the iPhone 5s. Some terminology is put in layman's terms and therefore may not be 100% accurate. For in-depth coverage of the issues with Touch ID as well as the underlying technology, please visit trialsandtribstech.blogspot.com.
For more perspective on the issue, I also recommend viewing Joe_Fo's Touch ID enrollment video (http://bit.ly/1gyIAVj), as well as the Apple Support Communities discussion titled "Touch ID being Erratic" (http://bit.ly/1bGiAme).