This effect is most likely created in software, not by camera movement alone.

In examples like this, clues include an abrupt transition between the sharp lower area and the blurred upper area, plus repeated tree patterns that look more like a digital smear than true motion blur. With simple camera movement during a long exposure, the whole frame area being exposed would generally blur together, and it’s very hard to keep the forest floor sharp while blurring only the upper trunks.

Possible in-camera workarounds exist—such as multiple exposures, masking part of the frame, or selectively lighting only part of the scene during a long exposure—but those setups are complex and still would not usually produce the same clean split between sharp and blurred areas.

So the most likely workflow is: make a sharp base image, then apply vertical blur/smearing selectively to the upper portion in editing, possibly with masking or compositing from multiple exposures.