Let's answer this question slowly: Could Javier Sotomayor jump over the head of the average giraffe?
Fully grown giraffes stand 4.3–5.7 m (14.1–18.7 ft) tall. Javier Sotomayor is the current world record holder in the long jump, with a personal best of 2.45 m (8 ft 1/2 in). So the answer is no.