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In theory that should work if the app can access a USB port on the TV and use the webcam. I haven’t heard of it being done though. The Apple solution works and it’s intended to be used like that.
But really, a lot of smart TVs run Android and Android has a surprising amount of supported devices (I suppose due to it basically being Linux). I bet you could hook a DVD burner up to an Android phone, and I’m sure a third party file manager could read files off a disc. Burning though? Should be possible but you’d need an app to talk to the DVD writer. And that, I’ve never heard of. You’d think a webcam would be easier but I think the software stack in an Android phone would only use its internal cameras without an app. The camera app for example is only going to look at the installed ones. It doesn’t know to look at the USB interface for more. But a third party camera app might.
I have a USB C hub and I do have an old Android phone (Galaxy S10, 2019). I do not have a webcam or DVD writer though.
That said, now that I think about it, if you hook a Samsung phone — not sure about others — up to a TV with USB C to HDMI, it kinda becomes a little desktop computer with the TV as monitor. I wonder, if you initiated a video chat, if you could do it with just a Samsung phone. Or really any phone that will display mirror to a TV.