Panasonic HC-V700 camcorder
I have the V700 and use it regularly for still photos. I use an Epson 1500W to enlarge them to US paper size B 11"x17". The results are stunning.
Clearly I cannot speak for other makes in this respect.
The V700 like many other models that use SD cards store the still photos and video on the same card and these can easily be separated when the card is downloaded. I use the supplied software HDWriter to transfer to my PC and this presents a page of thumbnails with either a video or a still icon on the picture. The files are directed to the appropriate folders by a tick on the thumbnail.
Hope this helps.