Reducing exposure time should be enough to work with here.
Since you're video recording their movements (from my experience) there isn't much else you can do unless you can get a much higher resolution as well.
Just an idea for an alternative way of tracking, (and I believe I'm treading dangerous waters here because
1) this is an idea and I don't even know what you want to do with the video, so I chose tracking as a possible application
2) not sure if it complies with the rules of answering a question)
If you can take a picture of the first shot with a high res camera (change exposure time, shutter speed etc.) and then immediately record a video with your hardware after that, you should be able to see the tags on the insects clearer in the image you first took.
If you want to track patters of a specific insect, perhaps extract the location of the corresponding tag in the image and the insect would be very close to the same location in the very beginning of the video (if not at the same spot)
Then you should be able to understand where which insect is in the video and track them.
The caveats here would be
i) Taking a low exposure high res image first and immediately taking a video after that
ii) if there's a cluster of insects all close to each other, you'd have to manually verify that the location in the video corresponding to the one you chose in the image has the right insect. Else you might end up tracking the wrong insect with the wrong tag.
iii) involves processing after capture of the entire video (or real time possible too)