Apex domains cannot have CNAME records.
Question and response
Question
dig videw.com. NS
Answer
videw.com. 3 NS rad2.xsp.ne.jp.
videw.com. 3 NS rad1.xsp.ne.jp.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0