You can use stealth to sneak around the camp killing the enemies one by one from
behind, although oddly enough the ability to drag bodies out of sight is a
skill that must be acquired through the game's RPG - like
skill tree feature.
But given the survival aspect of this game, the more time you choose to invest exploring and leveling up then the better time you'll have later on, with further abilities, like kills from
behind, quieter footsteps and so on can also be upgraded by way of
skill tree.