Don't need a trail cam and corn will change the deer's pattern any way.
Just walk in the woods and see where they are going in the snow and if you use your eyes you will see the limbs on shrubs they have nipped off the pawing in the snow under oak trees to get acorns, pawning in the snow to get a bit of green and dry grass and weeds. Find their beds in the snow where it has melted from their body heat loss.
Al