Does Amazon charge for Video today? I don't think they do. Maybe they plan too.
I know Bezos has stated in the past (can't find it though) that he believe Video will be the next growth engine, much like how AWS has been said engine over the last few years.
Only some movies and shows on Amazon Prime Video are actually "included with Prime". The rest you have to pay for individually.
Their Music service is similar. As a Prime member, you have access to a portion of their music catalog. If you want access to everything, you have to pay for it.
I know Bezos has stated in the past (can't find it though) that he believe Video will be the next growth engine, much like how AWS has been said engine over the last few years.