Some older smart TV models still have cameras built-in, which was removed in newer models due to privacy concerns. The camera on a TV located in a bedroom could easily be hacked and everything could be recorded with sound.

If it’s not possible to disable the camera trough settings, it’s recommended to put a small piece of tape over the lens. As for the microphone, it’s advisable to disable it as well, this usually can be done in settings, look for and disable everything related to Voice Control/Audio Guidance.