I do it a lot, too!
In fact, my last chapter its from the POV of a secondary character =P
And by some viewers its has been one of the best writen chapters (so far, I hope), so I think its a good thing =D
How I did it was to have this character in background, not very important, but we know that he is the school reporter, so when the school elections for high school council starts, I went for his POV to have a 'breath chapter', before the actual action start to happen and to have the opinions of different school second characters. I tackled some issues that the MCs didn't have, like inherent homophobia in society -that that people doesn't even know that its homophobic, and repeat those actions until called on them, and have a lightbulb moment to change themselves for the better.
All in all, you can always do it as you think best suits your story. You can use a higly profile character, so people don't get lost, or you can do it with an almost nobody, like me, and you can get away with it anyway n_n
There are some novels that use to change the POV from deutaragonist from one chapter to other. That's is always an option.