I don't have anything high tech, but I pull up the video on any video playing program on my computer. When I get to an area that I want to capture, I pause it. Sometimes it takes several tries to get the frame that I want. Then I press the Print Screen key on my keyboard. Open Paint, which is standard with most PCs. Press CTRL+V to past the photo into Paint. Crop to your desired size. Go to File, Save As and then save it as a .jpg file. Works for me, albiet time consuming and a little backwords.
The only issue I've had doing it this way is that I've had trouble uploading these to places like Walgreens Online to be printed. I had to find a file converter online before it would let me. Still, it wasn't all that bad.