This video from the Netherlands shows male and female common scoter ducks.
This is a scaup ducks video from the Netherlands.
This video from Florida in the USA says about itself:
3 January 2017
Male Ring-Necked Duck takes off from small marsh. These are flighty little ducks and this is the first time I got this species on video. A striking diving duck with black crest and goldish eyes: Ring-necked Duck (Aythya collaris).
Ring-necked ducks tend to favor sheltered waters more than the other diving ducks do. They are often found in small flocks on small, tree-lined ponds and shallow Florida lakes where they dive for plants and seeds.
The video is both at normal speed and in slow motion.