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.
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