I agree with @Ram - this 'question' is not defined and unfocused. I assume you are asking for resources.

For circos plots, I would recommend circular as it is very well documented. Another option is BioCircos.

To plot CNVs (amongst many other things) you can use ggcoverage.

For structural variants, I would recommend the command line tool samplot.

Finally, for CNVs and SVs you could always visualize using IGV, but I suppose that is a little less elegant.