1. Use the 3D Camera tracker to track your scene and create a 3D camera that matches the movement of the real life camera used to film the shot.
2. Generate the particle objects in Blender. You may want to take an environment map to use as the lighting source for the particles so the particles match and 'fit' into the scene.
3. Render the particles separately on transparent background.
4. Composite the rendered particles into the original shot.
Hope that helps!
have doubt still!
how the motion particles moves on the video and how to color the particles