How to extract region from GVCF file?

Question

[optimistsso4co3]

I need to extract chr6 from gatk haplotypecaller -ERC GVCF generated g.vcf file. I have used bcftools view, generating a file that resembles gvcf. However, is it correct way to do that? I have tried gvcftools, but it does not appear to have an option to extract a region and generate gvcf file.