Just watched the clip again on a larger screen.
As the camera is mounted on the left side of your helmet you get a skewed view of your view, if you follow. When you look right, the camera view is partly obscured by your helmet/visor.
Still maintain that you occupy the section of road which is the width of one car i.e. between and including the wheel ruts in the road created by 4 wheeled vehicles.
That is where all the dust and crud and drips of oil from leaky engines accumulate. Regularly riding there gets all that crap into your tyres, especially when the compounds are soft and could - potentially - cause you problems.
I was taught to use the full width of the available road from kerb shy line to centre line markings and to run either in one tyre tread or the other, unless positioning requires deviation. And that deviation of route requires a mirror/headcheck. Remember left side headchecks when entering roundabouts.

Further, irrespective of the use of mirrors and/or the knowledge of the position of your wingman, always give a headcheck to ensure that a) the road is clear for where you want to go and b) your oppo knows that you are looking for them.
Same applies when on the open road on your own and potential dangers present themselves, such as the lorry/van approaching from the junction on the left. Eyeball him and that means moving your whole head, as though sitting your (car) driving test. My car instructor drilled it into me that he could not see my eyes move to the mirrors but he could see me moving my whole head.
The bike course changed that slightly into 'Polly wants a cracker' mode, where you conciously nodded your head in the direction of the mirror/hazard/junction/whatever to show that it has registered on your radar. Getting eye contact with the drivers of potential hazardous vehicles is also, I find, essential. You need to see what they are looking at as well. If you can see them seeing you, then alls fine. If you see them looking elsewhere, watch out! The subsequent placement of your machine thereafter is as a result of what you see and what you see them doing.
Ultimately, you are trying to practice defensive riding where you always have an escape route, should the circumstances in front of you develop in an unforseen fashion. Equalise your dangers so that a hazard on your left does not push you into the path of the oncoming hazard. Balance your space between the two.
As said previously, good early work, just need to expand on it a tad.
