You basically use a HD texture pack for minecraft in the same way as a normal texture pack. First off, to use a texture pack you must first download one, you can find plenty on Minecraftforum.net. After you have downloaded your texture pack, you then place the .Zip texture pack file into the "texturepacks" folder. But for a HD texture pack you must first download MCpatcher, which allows you to use HD texture packs, you can also find MCpatcher on Minecraftforum.net or you can just simply Google it, and like before, you just place your texture pack into the "texturepacks" folder. After you have done this, Run minecraft and click on the "Mods and Texture packs" option, then the texture pack you have placed in that folder will appear as an option in this page. Simply click the texture pack then click "Done". All you need to do now, is play :D.
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When you downloaded the texture pack, it should be in a zip file. You have to put the .zip file into the %appdata%>.minecraft>texture packs if you are a mac user: Your Mac id>Library>application support>minecraft>texture packs. Do not use the Library in the macintosh HD Drive. Then you open up minecraft, then you go into texture packs and mods. Then choose the texture pack, then say ok, then play minecraft :)
He used the GLSL shader,Flows hd texture pack,and Modern hd texture pack.
a GLSL shader texture pack, hd that is most i know, beemo12
For HD texture packs (over 16x16 in resolution), you have to use either MCPatcher or OptiFine in order for the textures to work and animate correctly.
Mo'Creatures don't need McPatcher, but Minecraft HD does. McPatcher is actually easier to install mods and HD texture packs so "yes" to your question.