That video was already linked here on the forum somewhere else not too long ago. Good video.
Bio-intensive gardening is a method of gardening that could be compatible with the zone 1 gardens in a permaculture design. Permaculture is actually much bigger than just a garden though. Permaculture is more about system design that can include the people.
Actually, permaculture is many things and can be huge or small.
If you listen to
Bill Mollison, you can do permaculture on a balcony or in a sunny window. There is a family of 5 adults in California some where growing a huge portion of their own food on an urban lot so on a suburban lot I expect it could be possible for a family to grow much of their own food.
I live on a suburban lot of about 1/3rd of an acre. We have some
chickens and ducks as well as an aquaponics system growing catfish and veggies and lots of garden beds and I am now working on getting plants to turn my lot into more of a food forest so I don't have to put as much
energy into digging the beds and planting annual veggies and then weeding etc. I don't expect that we will ever be completely self sufficient on 1/3rd of an acre as long as easy food is available at the grocery store, however, we do now produce enough food right here to make an impact. Some times it is as simple as making use of something that is there. For instance, many people in Florida have some citrus
trees in their yards but most people don't bother much with them, the fruit drops and rots before they get around to eating it and they bag it up and haul it to the curb to be collected with the other
yard waste. While we have started to pick and juice what ever citrus would otherwise be going to waste. There is so much of it that I have to concentrate what I put in the freezer just to make room in the freezer for other stuff. We also slice and dehydrate things like thin skin tangerines which make great snacks skin and all. The sour oranges which most people are not interested in, I've been juicing and using like lemon juice.