Videomaker – Learn video production and editing, camera reviews › Forums › General › Video and Film Discussion › Video recorded on mute › If the interview was short
If the interview was short enough you might use a text crawl. It would look strange, no doubt about it, but it might salvage the piece. I had to do this once with a toast to the bride and groom at a wedding.
By the way, ALWAYS wear a headset when recording; this will prevent a multitude of audio glitches.