Generally they will record the tune as they would a song, all layers of guitars, drum and bass. Then in the videos, generally the "main guitar part" is played, harmonies may or may not be shown. Or if there is a solo not shown being played, some instructors make the solo a separate lesson.
There are many ways of doing it, I for one record video in a basic camera, and record on my computer at the same time normally. Then when I edit the video I remove the audio track and the video, and use the one I recorded, and synch them up.
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