From the article, it looks like it didn't have any impact on the cameras or inauguration security. It was just infected with a mail-bot that sent ransomware spam, much like thousands of other computers.
Although, even the article is written poorly. One part says it's "computers linked to surveillance cameras" and another part says "accessed 123 outdoor surveillance cameras". The first one is probably correct - they got their ransomware mailbot installed on some Windows computers used to access the cameras, and it was sending out ransomware.
The fact that they were used to access cameras isn't relevant. However, I think the fact that these are police computers, and police were likely doing other things on them (browsing, email) that got them infected, probably is relevant.