How get collection of the tiles (position + zoom level) for the current view

Set of tiles, which should be shown, depends from a camera position + orientation. The further tile is, the detailing is less.

Is it possible somehow calculate/get which tile from which zoom levels cesium will request for the current camera position + orientation.

Not through the public API.

You can get the QuadtreePrimitive with viewer.scene.globe._surface, and iterate through the tile load queues, however we can’t guarantee this behavior will remain the same release to release.