what if you can't play the video due to an internal error or something, podcast addict skips it and goes to the next one in the playlist. by doing this you missed the video. there should be an option to play the audio of the video that has already been downloaded. The audio is much better than not podcast at all.
You can already pkay video podcast in the background. Just make sure you disabled video foreground playback in settings/player. But in your case it won’t help you if the app fails to play the file. Please open a ticket with app version, android version, device, feed URL and episode name using the contact support button.