[P] Sign Language Recognition (SLR): How good is it really and can I make it work for a less popular sign language?

I've seen a lot of beginner tutorials to implement video stream based sign language recognition but they all seem to have some issues in a real world situation (Let's say a TV recording of a press conference).
A client asked if we can do this, so I started wondering:

* How good is the current state of the are for SLR really? Is it being used in practice?
* Are there existing models or even services that can just be …

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