Yes, it is possible to use Wi-Fi signals to monitor changes in the environment, such as detecting whether a room is occupied or not. This is known as occupancy detection, and it has been explored in several research studies. However, this type of monitoring typically requires more complex algorithms and signal processing techniques than those used for human pose estimation.

It's also important to note that most commercially available routers are not equipped with the necessary hardware or firmware to perform advanced occupancy detection tasks. As such, it's unlikely that this type of monitoring would be built into a consumer-grade router anytime soon.

Moreover, privacy concerns associated with such monitoring remain a potential issue, and regulations surrounding the use of such technology in homes and other private areas could be imposed to protect individuals' privacy.

Overall, while the use of Wi-Fi signals for occupancy detection is a possibility, it requires more sophisticated algorithms and hardware than those used for pose estimation, and it may not be a feature that is readily available in most consumer-grade routers.
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