Clip is a commercial for Kentucky Fried Chicken. Seems to be from the late '70s, early '80s.

Begins with a family - dad, mom, son, and daughter - eating lunch in a park. They soon see a marching band in the distance that soon approaches them. 

The band is accompanied by KFC's Colonel Sanders and his assistants, who share a KFC meal with the family to replace their non-KFC meal. Each is served a complete meal: Two pieces of chicken, a bun, macaroni salad, and mashed potatoes topped with gravy.

Everyone involved looks happy and satisfied. The last shot shows the band from overhead, spelling out "KFC" on the park field.