This effect can be created either in post-processing or in-camera.

For editing, a common method is to select a thin horizontal strip covering the area you want to affect, copy it to a new layer, then stretch it vertically with Free Transform. You can then reduce opacity or try blend modes like Multiply so it looks more natural. Another similar approach is to duplicate that area and apply a vertical Motion Blur (90°). A Wave/Distort filter followed by Motion Blur can also create a more stylized streaked look. Use a layer mask to hide the effect from foreground subjects you want to keep sharp.

In-camera, a similar look may come from vertical panning or intentional camera movement during exposure, while flash freezes the main subject and ambient light records the blurred background streaks.

So the most reliable route is post-processing with a duplicated selection plus vertical stretching or motion blur; intentional movement during exposure is the likely capture-based alternative.