You can change the settings for the 'Comments' on your videos if needed. You can edit them from either the 'Comments' section below your video or from the 'Share Settings' option under the 'Copy Share Link' button.
You can make your 'Comments':
'Public'- everyone can see and post comments with whom the video link is shared with.
'Private'- you as the video creator can see the comment and anyone else who comments on the video will only be able to see their comment. They will not be able to view anyone else's comments.
'Disabled'- no one can see or post comments