There are a few things to remember about the surf cams. They only show a certain area unless you view one that has panning features. There could be a blitz a mile up or down the beach and you would never know. They are helpful if you are looking at a few of them to get a sense of the swell that day. Of course if you see a bunch of little dots in the distance all clustered around you know either it is opening day of blackfish, fluke, etc, or they are out there bailing stripers or blues. The way this season is going you might not see it on the cam. Isolated patches of fish except for up in the raritan bay where they are doing pretty well.
The best way to know if there are fish is to go out there and actually try fishing for them.