No - Smart TV itself does not have zoom app, no webcam, no mic.
Yes - You need extra thing to get it work. For instance, install Zoom app on your tablet or ipad, connect it to your smart TV by using HDMI converter.Then, you can speak and video conference with others and they will show on Smart TV.
If your phone support Dex, you can plug your phone to Smart TV and start Zoom Meeting there.
So, all I can say is Smart TV itself cannot start zoom meeting,you need some external tool.