The issue is making use of the H.264 video encoding that's built in to the camera. Very few USB webcams have that. And it takes a special driver and software on the PC side to access it. The C920 works exactly like any other webcam in all other use cases beside this one. You can record full HD 1080p video at 30fps using the video codec of your choice, but your processor usage will be VERY high. Most Atom boards may struggle to maintain the framerate. That's where the onboard H.264 comes in. It handles all that encoding on the camera itself, so the PC just has to save the data to disk (more or less). Like I said, the only application that I know of for Windows XP/7 that makes use of the H.264 encoding is Skype. And even though Windows 8 supports that by default via the UVC specification, that capability is not yet fully implemented.