Talk to Urologist on Infertility Low Sperm Count

I am married for 5 years and didn't conceived even once . Got out are test done including hsg for me everything is fine with me but my husband has low sperm count like 8 millions and he is also diabetic and over weight. Taking medicines for this purpose but now after a year there is no progress so doctor asked us for IVF . I want to ask here is IVF The only option left for us? If his motility and count is still low how we can go for an IVF Is there any chance for success please help me and guide me properly