OK, if you like to see your text over a background (like a video, motion background, solid color or whatever), place this background on track 3 below the other two tracks. Next, make track 2 a child of track 1. That makes track 3 visible as the background for your text.
And if you don’t see the old film effect through your text, you might need to increase the grain and/or the size of the particles.
Theo