Are you in the US or the EU.
The reason I ask this is digital signage with motion graphics is heavily regulated, especially where it can be viewed from the street. And the regulations change pretty much town to town in the US.
Digital advertising in-store is pretty much handled by the franchise. I’ve only rarely seen it in anything smaller than 50Ksf venue.
DocPixel, asking to job shadow something like this is like asking someone “hey, show me how to do this job so I can become your competition.” It’s a student internship opportunity for sure, if you can find an opening, but no one is going to bring someone in off the street for this, especially if they have no previous aptitude.
Where I work, we mostly install the hardware handed to us by the content studio for the project. Or we buy it at their spec. The programming is left to the content studios. That is where the knowledge is. It really depends on the system and the client as to how that system is managed. A lot of it runs on proprietary interfaces. Some of it runs on internal computer systems that are loaded on site via data transfer from USB drives or DVDs, or over the internet. The stuff exposed to the internet HAS to be secured through a firewall and that is usually handled by the site IT service, not the content studio. There’s a lot that goes into this.
Here’s another resource.