TCA offers the possibility for conditional displaying fields using displayCond. for an instance HIDE_FOR_NON_ADMINS allows to display field only for admin, but is there a way to display given field only for its creator, determined by cruser_id field?
Not out of the box. You can hook into TCEMAIN (DataHandler) or TCEFORM (FormEngine) to archive this.
You can however use access rights and set the rights to show the page (storage folder) only the the given backend user. Check out the access module.