Here is a test video that uses pre-keyed elements from our stock footage collection: Action Essentials 2 for machine gun hits. I used 3 random clips with Trapcode Particular’s custom sprite option. Using a particle system allows you do build complex effects without duplicating the clip hundreds of times, while maintaining precise control.
You could potentially duplicate the particle system and make dirt marks or holes underneath the main particles. I’m sure you guys and gals will think of really creative ways of using real footage elements as particles.