I have this click here which is not exactly was you asked for but is a great low cost solution. It transmits a wireless signal to a receiver which can be connected to any TV with AV connectors. It's colour and also has night vision which is a bonus and can be powered by mains or battery.
At work here I use web cams to monitor the entrance doors. The software that comes with the web cams has sufficient functionality to produce pictures of who enters the building. Emails are sent with a picture when the web cam is activated.