Mark says he did "let's plays" of games (that's sort of like a commentary track but for a video game, and you'd record the visual too for that) by using a recording app on the iPad. I happen to know you have one of those available. I think all you'd have to do then is be in a quiet spot, know the ep well enough you didn't have to have it on loud and have the iPad or other recording device reasonably well away from the TV - or you could use headphones... oh my genius at 1am... um... and then you'd want to put in sync-up bits now and again like they do on Rifftrax. Like tell them when to start the episode ("pause as the logo fades to black and then start when I say now...") and then sync a line or two here and there in it to make sure they're on track. Then just upload it somewhere, I'm sure there's a billion and one file hosting places you could put it and link it from your journal/comms/whatever. You probably want to practice a couple times or script it out actually so you stay on track and that'd help you put the syncing bits in too.
There are also some various freeware sound editing things I'm sure so you wouldn't have to do it in one take if you wanted to cut files together and whatnot. It sounds like it wouldn't actually be all that difficult. As far as noise control, that's the harder bit, you'd have to try to be as quiet as possible in general... and then there may be some editing you could do as well.
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Mark says he did "let's plays" of games (that's sort of like a commentary track but for a video game, and you'd record the visual too for that) by using a recording app on the iPad. I happen to know you have one of those available. I think all you'd have to do then is be in a quiet spot, know the ep well enough you didn't have to have it on loud and have the iPad or other recording device reasonably well away from the TV - or you could use headphones... oh my genius at 1am... um... and then you'd want to put in sync-up bits now and again like they do on Rifftrax. Like tell them when to start the episode ("pause as the logo fades to black and then start when I say now...") and then sync a line or two here and there in it to make sure they're on track. Then just upload it somewhere, I'm sure there's a billion and one file hosting places you could put it and link it from your journal/comms/whatever. You probably want to practice a couple times or script it out actually so you stay on track and that'd help you put the syncing bits in too.
There are also some various freeware sound editing things I'm sure so you wouldn't have to do it in one take if you wanted to cut files together and whatnot. It sounds like it wouldn't actually be all that difficult. As far as noise control, that's the harder bit, you'd have to try to be as quiet as possible in general... and then there may be some editing you could do as well.