Nice. I've noticed the same effect if you stand in front of TV and play.
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Stingray club #90, Sterling club #90, EBMM club #102. Ovation Magnum club #1, Mesa Bass 400,400+ Club #14, Big Cabs Club #179, Mesa Boogie club #1317
There's actually no slow motion applied to the video, the effect is caused by the digital camera scanning the image one line at a time from top to bottom. Normally this happens to fast that it isn't an issue but in this case the speed of that line-by-line scan matches up well with the motion of the bass string to create this effect. Super cool!