Here is how it's done in photoshop: [this video] (2:45) It seems someone decided to remove the banner from the video frame. Have a look at the left guys hat, there is a little "v" from where the banner was (in the top red oval). Edited: [link] Original: [link]
Adobe calls it "Content Aware Fill" which is likely what you're thinking of. This was the video that blew everyone's mind, but its 7 years old at this point: [this video]
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