Silhouette filter

Hello to the forum, I’m new here and have a problem…I want to capture people with a live camera and these should be displayed in black on a projector (in real time)…the background should be seen in black / white…there is such a plugin on instagram by Hary Suryanto and is called “Silhouette”.
I hope you have any idea…

maybe you can show an example image of what you are trying to achieve ?