I appreciate all the effort that went into making a nearly two hour video about cash registers, but I don't have the time for that. Now if you'll excuse me, I'm going to go watch eight 15-minute videos in a row.
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I didn't watch the OP video either but all you need to know about cash registers is when you go into the store and hop the counter you can generally lift up the whole register and feel for a lever on the bottom which manually releases the cash draw. It might be on the side at the bottom too but I would check the bottom first. No need to fuck around with buttons or mess with workers.
Once you pop the draw the money is just there. 
"While I think you shouldn't steal from work for a variety of largely practical reasons, I'm not too broken up about it because I feel that the people running the businesses also create the conditions that encourage theft and that most people who steal probably don't feel like they have very many other options. Now, we could debate that, but I don't want to, so don't bother." 
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy:
registerphile 