or you could use the same app that I use. So to say I am using an app for removing watermarks from video softorbits.com and to be honest, this app is doing this thing perfectly, but as I know there are many more other tools that probably will be able to help you solve your issue. I think this is really possible via this app because I was editing a photo a couple of weeks ago, so go on and take a look, I hope this app will help you, at least you will able to remove a watermark from a video for sure :)