The dreaded borg from the Star Trek franchise are every bit as scary as they sound, but in a way this fusion of man and machine is rapidly becoming truth. Even as we speak, we share a lot of our personal information on the Web, where AIs pick it up as training material.
Also the very first human paralyzed from the neck down has been fitted with a Neuralink device, which has enabled him to actually control a computer and even play games. Also the topic of humanoid robots is now getting hyped, and many models are being developed. This is all cutting edge tech at the moment, but it was the subject of Science Fiction until now. Given the exponential rate at which technology develops, it won't be long until this is actual everyday consumer tech.