In this tutorial, it will show you how to create taking photos with long exposures. It would be a nice idea to do that in Photoshop. If the background is too dark the blend mode won’t work. You’ll probably have to use another one with a outer glow.
Create a new document and place the photo
With the Pen Tool(P), create a path for one of the figures.
Select the Brush Tool(B) and go to Window>Brushes or F5 to create our brush. Use 8px for the diameter and select Dual Brush and Other Dynamics. Follow the image below for reference.