Enabling moderation in your Canvas course's Media Gallery will require student media submissions to receive instructor approval before publishing to the gallery. If you do not want your Media Gallery to be collaborative or are concerned about abuse, turn on moderation to prevent student submissions from appearing without your consent.
If you have not yet enabled your Canvas course’s Media Gallery, you must first unhide the Media Gallery link in your Canvas course’s navigation menu. Please see this Canvas guide page with instructions for managing course navigation links.
Enabling Moderation
Perform the following steps to enable moderation in your Canvas course Media Gallery:
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Navigate to your Canvas course Media Gallery by selecting the Media Gallery link in the course navigation menu.

- Select the Actions button, then select Edit.

- Check the Moderate content checkbox.

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Select the Save button.
Approving Student Submissions
To view student submissions to the Media Gallery and approve or reject the submissions, perform the following steps:
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Navigate to your Canvas course Media Gallery by selecting the Media Gallery link in the course navigation menu.

- Select the Pending tab.

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For each video, you may view it by selecting the video thumbnail.
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For each video, select the Approve button to publish the video to the course Media Gallery or select the Reject button to refuse the submission.

Source: Managing A Media Gallery Kaltura Knowledge Article