According to Slate Magazine:
Verizon Files Patent for Creepy Device To Watch You While You Watch TV
The company has filed a patent, published last week, for a system designed to be used in the home to target advertisements at people. Using a combination of image and audio sensors, it would detect actions in your living room while you were watching TV. These sensors, deploying facial and profile recognition, would pick up “physical attributes” like skin color, facial features, and even hair length, and also detect “voice attributes” to help determine the tone of your voice, your accent, and the language you speak. Inanimate objects aren’t off-limits—the technology could also spot beer cans and wall art.