Yes, but that is what the research field is developing for (frontal detection is already robust, from the side it becomes more difficult, but you can integrate other sensors or objects for better identification, such as a joy-con or ring fit)
real-time performance on jetson nano boards
Study 1
Study 2
etc. you can find a lot about it and real-time use is becoming more feasible.
Idk I feel like this is an area where I expect Nintendo to really make use of NVIDIA's partnership.
Ubisoft probably begging Nintendo to add a front camera just for this
how funny would it be for Nintendo to perfect Kinect when MS couldn't (granted, they did after dumping gaming)