In this way you can use a camcorder, for example, to add zoom, pan, and better images to your video. The same principle applies to audio. Like the cameras, the microphones that come with most digital video cards, are almost always compromises. If they don't work in your situation, you need to purchase one that does. This may mean getting a microphone that can pick up the voices of a small group without all the background noise that a small group can generate.
Lighting can be key to getting good video.
The elimination of background noise can be key to getting good audio. Pay as much attention to your production environment as you would to choosing your equipment. Forgiveness is divine. Finally, everyone needs to remember that this is new technology. It will rarely result in perfect audio or video.