Video Surveillance in Housing legal?

I live in the state of California.

Is it legal or illegal to have video surveillance camera (without audio) in my own room, dinning room, garage area and the front main door inside my own house? When i have people visit me and they see the video camera on the celling in my dinning room is it legal to have? Can the people sue me or call the cops on my because i have a video surveillance inside my house? Thanks.