Video conference chat (using webcam) API to be used with a PWA on SMART TV's

There is a task to develop a web application to be accessed on SMART TV (with built in browser). All is fine except for the requirement to enable video chat within the PWA. Even if the SMART TV allows connecting webcam via USB I am not sure if that would be accessible by the PWA.

Alternative is to use a web based (maybe 3rd party) service to utilize a network / cloud based webcam. The backend / front-end would access the webcam by that cloud service. Any suggestions in regard to available cloud based API’s or any other suggestions to solve this issue? Thank you.