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The highlights and fancy replacement preview are added by a plugin called anzu[0], but otherwise this is a standard emacs feature. I couldn't tell you what the default binding is but the function is query-replace-regexp.

(I don't understand why people are trying to bring multiple cursors into this)

[0] https://github.com/emacsorphanage/anzu

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I use replace-replace-regexp a lot. What was shown in the video was qualitatively different. Multiple sites were shown changing at the same time. That's not what q-r-r does, even with "bang" version mentioned above. You could actually see the old text replaceable by the being-entered new text.

The buffer was not being edited when the replacement was shown to be happening. The plugin anzu uses overlays[1] to show the text being replaced and the replacements.

[1]: https://www.gnu.org/software/emacs/manual/html_node/elisp/Ov...

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