Ive been Blessed to have been successful from the ground, so ill just throw my 2 cents worth in.
In my opinion camo is important, but not nearly as important as having good back cover and playing the shadows of the woods.
Deer will pick up on movement but that is somewhat neutralized by having good back cover and having shadows in your favor, move slow and move based on the deers head position and its ability to see you move.....OHHHHH and expect to be busted, because it happens to all us ground hunters. Hunting from the ground is like playing Chess with the deer having the upper hand but there are times when your pieces will all be in the right position and you will get a
" Check Mate".
Dont let hunting from the ground intimidate you, grab your stool or tree seat and go gettum killer!