How do I change the caption on a video?

Question

Video processing

There is a common video in which people meet in the city center and show each other a business card.
Is it possible to somehow edit the inscription on this business card with a program without experience?
In extreme cases, how easy is it to make the desired part of the video blurred? i.e. a certain square 5 by 5 cloudy

Answer 1

Search YouTube for a video on "after effects tracking".