To the extent that IT becomes responsible for doing the installation or the service, the more they will want hardware that is consistent with their existing selections. For instance, if IT is responsible, they will prefer purchasing servers and storage from their existing suppliers (rather than from a video surveillance manufacturer).
A key aspect is understanding the IT department's level of interest in doing this. Some want no part in security projects, others will be aggressive about managing it. This will be a function of budget and ambition on the part of IT. On the positive side, IT may be able to reduce costs of hardware because of their volume contracts and direct purchasing. On the downside, IT may not want or be able to take on this project (especially because of increasing budget cuts).
While the best technology for your specific risks should drive your product selection, a number of important IT elements must be taken into consideration. By appreciating and ensuring that each of these 5 areas are factored in, you should be able to smoothly gain IT's support for your project.