[squarefoot]

Not a camera, but a cellphone potentially yes. The MEMS accelerometer contained in all phones is a device that turns position and acceleration (therefore vibrations) into digital values, so they could be sensitive to sound, especially when put on surfaces that resonate easily to ambient sounds and voice, like a table. Most if not all accelerometers are however sampled at much lower frequency than sound, then have their signals fed through a low pass filter, which could be either or both digital and analog, so in theory it is possible, still very hard to achieve without some deep hacking. However, if a cellphone was manufactured to allow it, then any app aware of this would have the ability to listen to sounds without involving the internal mic.