Will Samsung Technical Support see me through my TV's camera when he is conducting remote service?
The Samsung Technical Support could see you through the built-in camera but only if they are accessing an app that uses the built in camera (Skype, Camera app, etc).
The Samsung Technical Support will never access these types of apps while connected to your TV unless they are specifically asked to do so in order to test that particular apps functionality.
You can set the camera to the closed position to prevent Samsung Technical Support from seeing you while accessing the application.
There is no way for the Tech support to access your built in camera without your knowledge.