The main camera on the Nokia Lumia 925 can shoot video in 1080p at 30fps. It also has a front-facing camera capable of shooting 720p video at 30fps. That's all par for the course on a flagship phone, and video in general doesn't impress quite as much as stills, but it puts up a reasonable performance.
When you launch the camera app you'll find options to adjust the white balance, turn continuous focus on or off and switch the video quality between 1080p and 720p. You can also turn the video lamp on or off.
Unlike the main camera there aren't any scene modes or fancy features, but that's fine, since such things are less often used on videos.
As with the stills camera, you can use the hardware camera button to start and stop recording, which is a lot easier than tapping around on the screen, particularly as doing the latter can cause camera shake.