Yes, you can install a reverse parking camera in Alto 800 and for the same, we would suggest you to visit the nearest service center as they have an accessories department where you can get it installed. You can click on the following link to see the details of the nearest service center and selecting your city accordingly - Service Center.
The exact information regarding the CSD prices of the car can be only available at the authorized dealerships. We would suggest you to visit the nearest authorized dealership for further information. Click on the given link and select your city accordingly for dealership details.