I've added a small notification next to the top menu when video rewards are available. Please don't lynch me for this... if you have no interest in it you can disable it completely in the Settings page and you'll never see it again.

I've added it simply because it is really easy and it's incredibly popular on Fallen Sword. It seemed far cleaner and nicer than the offer walls and I felt Legacy was missing out on a much nicer simpler option to earn free platinum. Hope you like it anyway!