Here’s the official Warner Brothers synopsis for this movie:
The final chapter of the Harry Potter film series begins as Harry, Ron and
Hermione leave Hogwarts behind and set out to find and destroy the Horcruxes—the secret to
Voldemort’s power and immortality.
You can watch the clip here. I’ve found a kinda grainy one here:
And one with a littel bit more footage from HBP here: