I, also, encountered this request last year; I declined. After only being asked on a few occasions, I do not recall seeing it again. In my opinion, it was an attempt to garner more for the same fee, which would have become less over time.
Almost 16 years ago, on a Quizno's shop, I encountered my first request for a pic; it was optional and I was paid an extra $5. Today, such is often required and with little to no extra pay. It is certainly possible that if shoppers were to accept the practice of extra video/audio inserts, they would become mandatory and the fees would not increase.
Your post was deleted because at the very bottom, in point #4, you named the Client, which is in violation of Forum rules. Please feel free to re-post, without the violation.