I came across these videos and I can't tell how they were created. Photoshop? After Effects? Something else? The brush used in the video - anyone recognize?
put on hold as primarily opinion-based by Moab, DavidPostill♦ Jan 12 at 19:52
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Based on the artifacts showing in the video, the images were created in complete form using any number of graphics editing software. I think the video was then created by erasing components of the work and playing it in reverse.
You can observe branches from the main body appearing when the "brush" had not yet traveled in that region.
It is easier to erase smoothly a circular segment while recording than it is to freehand such a segment.