Send Serial data and Ethernet data both over WiFi
Suggestion is to first do a lot more of requirements engineering. Just a few things that I could spontaneously think of:

How much data does your system need, per video source, and overall?
How many endpoints are there?
How far are they spread out?
How many access points will you need?
How many access points can you add at most, so that your overall
capacity increases?
What are your latency requirements?
What are yourreliability requirements?
How are these devices powered (i.e. when
removing ethernet, aren't you also removing PoE and thus need to add
back another power line?)?
How OK is the scenario that a group of people watching youtube using an (ad-hoc) wifi on the same channel occupy &gt; 50% of the available spectrum?
How important is it that someone outside your facility can't figure out how much movement is in the video, based on observing the amount of data exchanged over the air?
What problem are you solving here, and is what you're proposing actually a solution or does it just sound progressive?