Welcome to Android Forums! Sorry for the delayed response.
Unfortunately, I don't know of an app that is specific to your purpose. The only idea I had was to get a screenshot app, and take a screenshot while the video is paused. I believe there are several screenshot apps in the Play Store.
I hope this helps! If not, there are two avenues: You can re-submit your question with additional info the same way you submitted this one, or you can join the forums for a better back and forth exchange of info.
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