Since my profession is electronic and software design and I am almost someone who is doing this as a hobby
I know quite well what is possible and what is not
So no it is not possible. mostly because of power issues as even if you can make a device that will spy on you it eats lots of power and cannot work any reasonable time from the battery.
but also other simple problems like camera placement.
I wonder wahst kind of other mystery sensors can show fine detain at over a mile? the only sensor which can do that is a camera.
Next, if someone is spying on you and they managed to reveal something uncomfortable no problems, just claim it being deep fake. On this day you can fake pretty much anything with the decent quality so no point to bother with spying. If someone presents something incriminating you just laugh and compliment the quality of the fake video.
If that information cannot be used legally then who cares?
In fact, it becomes kinda interesting and flattering that I am so important to be worth spying LOL
although is my spy is willing to see me watching porn I would rather offer to watch it live LOL
Oh, totally forgot, I have no webcam so nobody can see me LOL