Views Hierarchical Taxonomy Filter extends Views with an option of using hierarchical taxonomy select in a capacity of the exposed filter.
The module adds to Views a special filter that enables selecting taxonomy terms of the specified vocabulary consecutively.
The selection considers terms hierarchy and uses AJAX for set of “select” type fields, in which a value of each next depends on the value of the previous.
It works in combination with other taxonomy filters, including the same filter, used for the other vocabulary.