When I was an agronomist I tried with several seed companies to get that kind of information but they didn't want to provide it. I am not certain if that has improved or not.
Most farmers are using 'precision agriculture' and fertilizing by either 2.5 acre grid squares or grids within individual soil types.
Cameras cost: $1 each ($20). Wiring: $2 each ($40). Computer cost: $120 (inc 24v PSU). GPU cost: $60.
That sort of equipment isn't going to be worth stealing.
Of course, adoption isn't universal [1] - a large farm will see a much faster payback time for the same bit of equipment, for example. And many farms will have other priorities for their limited capital; tractor auto-steer is much more popular than precision weed control.
It wasn't mentioned in the video, but you can get kinda close to what you're thinking today. When harvesting the crops it's possible create a map of the yield throughout the field. Then with combinations of random sampling of the soil throughout different parts of the field, one can adjust the fertilizer distribution thought the field. Finally, when you go to plant the crops next year, you can utilize this data to configure the planter to automatically space the plants a little closer or farther apart. Many farmers are already doing exactly this.
University and seed researchers sometimes do the plant by plant analysis you are taking about. They are looking at just a few hundred samples though and only getting slightly better data.
There has been a similar thing for decades, from planes. But drones mean much more regular intervals and much higher resolutions.
Surely in todays world, it's very cheap to simply have a bunch of cameras looking down at the plants, and track from each seed, to each plant, to each leaf on the plants, to how many cents that plant earned you.
When you have that kind of tracking, you can do things like "If a plant is within 30mm of a neighbour, we will earn more if we kill one plant and let the other grow. Kill whichever is currently smaller".
Or "if a plant is growing within 2 inches of a rock, give it these extra nutrients".
Treating each plant separately should give much higher yields.
Our current system is equivalent to a human medical system which doesn't inspect each patient individually, but instead just prescribes medications to entire towns!