This grain is not a basic computer generated grain,
but it’s based on scans of 35mm film with digital post-production.

In the ZIP archive, you’ll find a video of 10 seconds duration.
Video is in 4K encoded in Apple ProRes 422 @ 25fps with neutral gray background.

Very easy to use with all video editing applications supporting layer blending modes.
Add the film grain video as a new layer over your footage and apply « Overlay » blending mode.

Full details and download link