MySQL doesn't allow to create a view with subquery. The possible workaround would be to create separate view for each subquery.
For example:
CREATE VIEW movies_view AS
SELECT COUNT(*) cnt
FROM `directors winning movies list`
GROUP BY `directors winning movies list`.castID) z)
CREATE VIEW movies_view_count AS
SELECT MAX(cnt) from movies_view
Call the movies_view_count
in your main query and it should work.