How to View Video Thumbnails on Your iPhone?

We are making a trial production of an app for the iPhone in the Monaca cloud.

The video obtained using the captureVideo of cordova looks like a picture of a standard app. I would like to play the video cut by thumbnail display and clicking it.
You can cut the video on the first frame.
I would like to process the video only locally instead of sending it to an external site.
In the end, I would like to use Android as well as iPhone.

I used a video tag, but the thumbnail does not appear until I play it once.

I would appreciate it if you could let me know if there is any way to display thumbnails with a video tag, create thumbnails locally, or use a different video playback plug-in.