Hello and Happy New Year
I make videos from my Mega STE regulary - you may see a lot on YouTube. What you need for that is come video capture card or external USB capture (TV) device - with composite, and better with S-Video input. Prices are about 30 Euros ++ .
In case of TT you need capture card with RGB input, since TT has no regular video output. You can buy such cards now, and prices are of course higher. Google little for rgb capture cards .