https://www.youtube.com/watch?v=DiFtmrpuwNY
Dr Steve Mann who eventually led the Google Glass team (along with Dr Thad Starner, who like Mann was also a frequent poster in the MIT wearhard mailing list) did this ages ago with a system he and his students called Eyetap.
Mann is famous for among other things being probably the first person to be roughed up for being borged out.
https://www.forbes.com/sites/andygreenberg/2012/07/17/cyborg...
https://www.nytimes.com/2002/03/14/technology/at-airport-gat...