How to combine hand trajectory captured from 2 different angle to one trajectory in 3D space?

It is possible that such a question already exists on stackoverflow, but I am really lost and have not found anything useful. I am using python and 2 cameras at known location. This allows me to capture a trajectory of a moving hand (that algorithm returns me 2 trajectory lines, captured from different spot). Now I would like to combine this information and build trajectory in 3D space. Does anyone know if there is any python library for this sort of backprojection? Thank you.

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