Combining Tobii eye-tracker with some software (machine learning) based correction system might be interesting project to try. You could collect training data

Combining Tobii eye-tracker with some software (machine learning) based correction system might be interesting project to try. You could collect training data by setting up webcam through teleprompter, regular webcam and Tobii on a machine. Just record normal usage and then learn a model using eye-tracker data and regular webcam data as input and data captured through teleprompter as target. With Tobii the system would also know who you are looking at on the screen. With custom conferencing software, you could deliver the software modified eye-contact stream only to that person. https://gaming.tobii.com/product/tobii-eye-tracker-4c/ https://gaming.tobii.com/product/tobii-eye-tracker-4c/