Getting It On (1983)

Alex Carson is a shy, handsome high school freshman with a huge crush on Sally Clark, the girl next door. He convinces his father to invest in his "video business" so he can video tape Sally without her knowing it. With the help of his mischievous sidekick, Nick, they begin to record hidden camera footage of Sally and other pretty girls, until his "peeping Tom" hobby becomes a full-fledged business with outrageous results, including a back-fired revenge plot against mean Principal White.imdb