I tried taking a video of the water like you did of your pool, but it was impossible; so here are a handful of sequence stills.
This began twenty years ago with a small galvanized "cow tank" to which I added a small pump and fountain, mostly for the birds. Over time rocks were stacked and plants were added. Now the tank is behind rocks and a row of hostas. The back half of the tank is under rocks and some creeping plants; the front of the top is an access to a pump and filter. Eventually I think I can completely conceal the entire tank.
The pump pushes water up the hill in a concealed hose and accesses the rock garden "spring" under a a fairly large Creeping Yew.
It flows out of a mini grotto, down a shallow stream birdbath ...
and spills over a tiny waterfall ....
... into a sunken pool, over a piece of petrified wood into a lower pool under the rocks and spills down into the tank.