It appears and dives on the surface and make the waves are slover and more viscous.
You can see how the waves develop. It hard to become strong because of the ice chips inside.
They carry it to the shore slowly and smoothly and blow up here into sparkling splashes.
The ice does not formed immediately. First, thin young ice is appear, which must be broken by the waves. Then waves push it onto the shore. This is how ice hummocks are formed.
The wind carries the peases of the ice arround the lake and to the mouth of the river.
There are people who enjoy winter swimming. They like to riding on ice floes on the river, jump to the water and come back on. But this is not on the video, cause they do it usually at spring, they ride on the big thick floes. There are only waves on the film.