You can extend the deadline of an interview by opening the interview and choosing "Edit interview".
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You can adjust the date by clicking "Open until" and choose the date and time.
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If the video interview has already been closed, the system will ask if you would like to open it. You can do so by clicking "Open it?" (demonstrated below)
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The candidate can access to the interview using the same link as before.
If you wish, you can resend the invitation to a candidate by choosing candidate's profile and clicking "Send message" and "Resend invitation with email".
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Please note that candidates won't be informed about deadline extension automatically.
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Currently, it is not possible to adjust the deadline for just one candidate.