No, that would just give you a link to the video and not something in an image format. I suppose the easiest way to do things is to pause the video, do a print screen and then paste that into MSPaint and save the image. At which point you'll need to crop away everything (black borders, other background) to leave just the raw image.

So you would go from something a bit like this:


To this:


Then you upload the image (in the correct size/ratio).