How to count the paired end reads number in given regions

Question

[ben.kunfang]

Hi,

I have a celltype.bwt2pairs.bam file from HiC-Pro. I would like to count the number of the paired reads in given regions, for example, how many paired read on the region chr1:80426-82426 and its mate on the region chr1:75071-77071.

Thanks in advance,
Kun