I assume you want to extract an image from a movie, and produce a still picture.
How you do that will depend upon what type of movie file your camera generates.
My camera creates a .mov file (that is a movie name with a .mov extender - e.g. story.mov"
I use the Quicktime program (free from Apple for PC) to play my .mov files.
Here is how it is done with Quicktime:
Click File and navigate to a .mov file on your computer. And load the movie.
Start the movie and when you get to the place where you want to capture a single photo, click Stop.
On the Quicktime menu, click Edit, click Copy.
Now start the Windows program called Paint.
On Paint's menu, click Edit, click Paste.
There is your picture in Paint.
Now click File, click Save As
Set the "Save In" window to the location you want to put the photo.
Set the "File Name" to an appropriate name
Set the "Save As Type" to .jpg