You can use the --work-treecommand option git:
git --work-tree=/path/to/cvs/project --git-dir==/path/to/your/repo/.git status
git --work-tree=/path/to/cvs/project --git-dir==/path/to/your/repo/.git add .
You will see your CVS content as the working tree of your git repository.
git, --git-dir.
cd /path/to/your/repo/
git --work-tree=/path/to/cvs/project status
git --work-tree=/path/to/cvs/project add .