You can listen to an audio recording of Mary Shelley’s Frankenstein here.
The following animated video provides a good introduction to Frankenstein and to the circumstances in which it was written:
The following, slightly longer BBC video from 2006-2011 covers much of the same ground, but in more detail:
The first known film of Frankenstein was directed by J. Searle Dawley for Edison Studies in 1910. Only one copy survives and you can watch it here: