How to zoom to a selected feature with pyQGIS

You need to set the extents of the map canvas to the extents of the selections:

box = layer.boundingBoxOfSelected()
iface.mapCanvas().setExtent(box)
iface.mapCanvas().refresh()

Zoom to selected features can also be performed by triggering the "Zoom to Selection" option of View menu.

eMenu = self.iface.viewMenu()
eMenu.actions() [12].trigger()

Note: The index number may vary with different QGIS versions.

Or more directly:

iface.actionZoomToSelected().trigger()

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