screen capture realtime merge blend over videogame screen over top of it

[jasonbee]

screen capture real time merge blend over video game screen over top of it
I have experience something on my laptop and wonder if its possible. when playing a video game I have experience a video capture screen that merges of kinda blends with the actual video game screen can this really be done in real time

[jasonbee]

or to merge and unblend