Don't really need photoshop. It's not all that hard to get a setup like this working with cheap converters from Amazon. It's whether somebody's grandma who refuses to upgrade from a TV that old would know how to do it that's the questionable part, but it's not impossible somebody set it up for her.
I can actually imagine my grandpa doing this. I wouldn't call him a computer wizard by any means, but he has surprised me before. He will just go to the library, and have the librarians find printed computer magazines which would deal with various connectors, learn about HDMI and composite. Then proceed to find another magazine which has reviews of adapters and take a bus to the big electronics shop to ask about adapters and have them place the order for one.
He actually did this when he needed to digitize some tapes. Granted, he ended up with a firewire-connected external sound card and a tape deck from a hi-fi store connected to Audacity, when all he needed was my old walkman, a 3.5mm cable and Windows Recorder, but hey, it got the job done.
He used to be a researcher and he somehow sees these things just as requiring time to find the right source of information... And time he has.
Well, he did move to live on a remote island (no power, no other people, no access for 5 months out of the year without a helicopter) at age 72. Lived there for several years. Also grew much of his own food for a almost 20 years.