Earlier quoted context omitted.
Sure, here's a video about how to build one with a Raspberry Pi: https://www.youtube.com/watch?v=LI59iFtDspA
Here's a readable summary (also said below): Raspberry Pi that runs the python program that sends video to the webserver using ffmpeg. Adafruit Motor HAT to connect the motors to the pi. Android phone is strapped to robot that runs a custom android app that receives chats from the website and also says them out loud using the Android API for text-to-speech. Everything sits on top of a 3d printed chassis. Cheap logite…
Guessing the software arch, you encode the video on the robot and then send it to your backend site. Then you have a separate listener on the pi, that just takes single commands from the website. I imagine not running a webserver on the pi makes the response much faster and doesn't run down the battery. So for a private webcam in my house, a kind of alarm system, i need a system there to capture the video stream and act as a remote host that I can access from outside. I don't want to copy your webserver stack, I'd prefer something lighter weight, that I could run as a service on a linux or windows pc.