Windows – Where is the Camera Codec feature available in Windows 8

I use Icaros.

Once installed, you need to enable .webm and .3gp file extensions (things like .mkv are already there by default, no idea why these two are excluded).
Simply run the installed start menu item, hit Deactivate Icaros (so you can edit the options) and append ;.webm;.3gp to the Thumbnail Filetypes Registered input box.

From here you can disable filetypes if you wanted to stick to 'the idea being to only add what's missing and not replace what's already there from Microsoft'

Hit Activate Icaros and open a folder with those files in. Done!

It does some cool things like enables Windows to pull properties of the video, like length and resolution (so that it displays it at the bottom of File Explorer when selected, just like with .wmvs)

I can't quite remember, but I think it also performs things like black-frame-detection. Id est, if it thinks the thumbnail it chose initially is poor, like a really dark image, it will look for another frame to use instead.

You should try using Camatasia Studio with a lower resolution.

You could also try installing these codecs.