Picture posting is enabled for all :)
I definitely wouldn't use the method in that video! It isn't really a raised bed, it's more like a big wooden window box with a space underneath it. One of the best things about planting in the ground vs planting in pots is the fact that you hardly have to water once the plants get established roots going. A raised bed will give you the advantage of quicker warming and better draining soil while still having the benefits that deep-rooted plants in the ground have.The video shows a nifty way of making cheap wooden troughs for planting. And yes if you're planting next to trees that would be a good idea ... but in the summer they will require a lot of watering just like plants in pots do.
I paint my ones with coloured woodstain to give them a bit of protection...my old free pallet wood ones lasted 9 years like this!http://www.allotments4all.co.uk/smf/gallery/3629-200815212015.jpeg