That used to be my MO back in high school and college. Even now, when I was working, going to work functions with co-workers I kind of just hung out and observed. But with people I'm more close with, I'm more open. As a general rule, I've come out of my shell like 2000%, but I'm still very shy with people I've just met.
I remember during my senior prom, I mostly hung out by the soda machine in the corner...yeah. That was prime example.
My advice, if you want advice, is to not worry about being recorded and making a fool. Either they won't care, of it they do, they'll just record you in fun and you can laugh about it with them. And I'm sure no one cares about what you're eating.