Micro Ventures

Micro Ventures is a live-action/animated series created by Hanna-Barbera Productions which originally aired as a four-minute segment on "The Banana Splits Adventure Hour". It ran for only four episodes from November 9, 1968 to December 21, 1968 on NBC and featured actors superimposed with animated microorganisms.
Summary.
In each episode, Professor Carter and his two teenage kids, Mike and Jill, use a shrinking machine to shrink themselves and their dune buggy to miniature size to explore and experience the world from the perspective of an insect.