Convert PAF format to SAM/BAM format
The paf format does not have the CIGAR string and base quality information that are typically present in a BAM/SAM file. While it is in principle possible to write a paf2sam converter, it's going to be very difficult to regenerate the CIGAR string with all the indel information (and maybe it's probably impossible to do so) that you'll need in a BAM/SAM file. If your motivation is to get coverage information, it might make more sense to convert the paf file into a bed file, before using a tool like bedtools to convert it into a coverage track.