Fill in the blanks with what you hear on the video

Fill in the blanks with what you hear on the video
 

Is that sentence correct?

Yes.

"Fill in the blanks with what you hear on the video"

The only grammatical qualm I have with this sentence -- which is, perhaps, more idiomatic than strictly "textbook" -- is with the phrasing of the last three words. It is more common for one to hear and see it phrased "in the video" rather than "on the video".

Cheers,
~Nick

Both 'in the video' and 'on the video' are used. The former is more popular, as Nick pointed out.

I think ..."from the video" is better for that is the origin of the sound

on the video means more like something physically in contact with the video.

in the video means more like something physically inside (enclosed by) the video.

However, both are used idiomatically quite frequently in American English to mean '[heard] from the video' and, as such, neither is wrong.

Ok, thanks.