If it's the only (significant) chip, then it's probably some kind of SoC that runs the software of the camera, with interfaces for the camera sensor, microphone, and communication.
Sometimes it's impossible to find information because they may be custom designed by the manufacturer of the camera, or just some really obscure part that doesn't really see the light of day from a design perspective outside of the country or region where the camera is designed.
If nothing shows up in a search of various datasheet websites, I'd probably just cut my losses. You could end up spending a lot of time trying to track it down and never find it.