How to change webcam video

[SCHIROKY]

I am looking for a method to change an inserted webcam video from a rectangular to a round view.
But I did not find a way to do it. Could someone please advise how to do?

 

[koala]

Use the image mask/blend filter:

Image Mask/Blend Filter | OBS

OBS (Open Broadcaster Software) is free and open source software for video recording and live streaming. Stream to Twitch, YouTube and many other providers or record your own videos with high quality H264 / AAC encoding.

obsproject.com