goodreader
User Manual
How to Make Video
Snapshots

How to Make Video Snapshots with GoodReader App

You can use the GoodReader app if you have a video for which you want to extract a frame of it as a picture.
First, transfer a file to GoodReader (see: How To Import Files & Folders), then tap a file name to open it.
After file import you can use Save Snapshot feature.

Saves the current frame as either JPEG or PDF

This feature is a part of Pro Pack.
Related Questions

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Been a user since first iPad back in 2010

For me a self proclaimed content junkie I have collected a PDF library in excess of 130GB and Good Reader is the best app I have found to consistently give me the results I'm looking for! Over the last 8 years I have not been without problems but the creators of the Good Reader app are very good in supporting their product! This is the first app I recommend to everyone! My life would be even better if I had bug free way of moving mass files from my Mac to my iPad.

RadioWV, Review on Apple Store