Fountain supports video publishing for podcasters.
When you publish a new episode, you can upload a video file. Fountain will extract the audio from that video and place the audio file in the main enclosure of your RSS feed.
The original video is then included in your feed as an alternate enclosure, which means podcast apps that support video enclosures can play it.
This approach keeps your feed compatible with audio-first podcast apps while also making video available in supporting apps.