1. Place the desired overlay on a new track or layer on top of your footage
2. Play around with the blending modes (Screen, Add, Color Dodge, etc)
3. Adjust the amount of light by lowering the clip or track Opacity
4. You can also customize the speed of the effect, add some color grading, change luminance or color by adding Levels, Color Balance, HSL and other filters
5. You can combine various overlays together for achieving the desired effect