Does Tesla really care that much about efficiency? Sentry mode chews through about 1 mile of range for every single hour it is active. My doorbell camera takes significantly less power to do motion detection than my Model 3 does.
You're fanboying for Tesla. The car is pulling as much juice as a gaming rig. The doorbell uses like three orders of magnitude less power.
And what do I get for all that power it's consuming? It routinely misses cars and people literally inches away. Sometimes it records, sometimes it doesn't. And lately my car has decided 90% of the time not to turn on the dashcam, though sentry mode activates pretty reliably. It's half-assed. Tesla needs fans to hold them accountable instead of white-knighting for them.
You sidestepped my questions. Does your doorbell have one or eight cameras? Even if tesla did it as efficiently as your camera, it would be, at a minimum, eight times more energy. If they do anything fancy with a neural network (which they almost certainly do), they it might be another 2x the power. Then you have 10x the power which is one order of magnitude.
Quit making false comparisons to your crappy doorbell. It is very different and they're designed for very different things. They don't work the same.