That's a unique post /question ! But there's a first for everything on T'net, haha
Yes, when we md'rs are making live-dig show & tell videos, it's only natural to narrate it. Ie.: "here's a signal. It sounds like it's going to be such & such. I have my settings on such & such. This site has given up 3 seated dimes so far on our last trip. I spanked my buddy two to one here. Let's see what this one is", blah blah
I do my videos with my smart-phone camera mounted on the up-turned bill of a baseball cap. The use a belt-clip that holds the camera on-the-bill, aimed downwards. After some fiddling and aiming, got it to where it aims right down to my swing arc walk direction, and dig direction. And then just narrate as I'm doing whatever. Sometimes un-plug the headphone jack so the viewer is hearing the various thing I'm isolating, etc...
In the old days, only something like a go-pro camera could achieve this. But nowadays, smartphone video cameras have gotten SO good, that you no longer need dedicated separate device, like go-pro.
As for being all alone and talking with no one around: I wouldn't think any passerbys would think anything about that. Because these days: People have blue-tooth devices and earpieces for their cell-phones all the time. So essentially: People these days are talking to themselves all the time.
If someone mistakes you for an insane person, and puts you in the looney-farm, we will pass the hat , take up donations, and send you the $$ for the commissary store that the asylum has.