Well software alone wont do it...you need a camera to record the video, and a computer to record the audio. [Sometimes you can get lucky and find a way to record both audio and video at th same time with a webcam...but dont expect anything great in terms of quality there...]

Then on the computer you'll need software such as Adobe Premiere elements or one of Sony's video editing programs to import both media, sync the two, and then position and edit what and when everything is seen on screen.

It's not an easy task but it can be done with the correct gear and enough time/money.
Last edited by moody07747 at Sep 30, 2010,
Record video, record sound, sync them. Then use some video editing programm to do that.