Without plugins… You can try this:
Make a copy of the clip, and put it above the original. Apply the gamma correction effect, and bump it up to 1.
Then apply a blur effect, you can play with the amount to get the desired effect. Then apply the set matte effect, change the “take matte from layer” to your original clip. Change “use for matte” to luminance.
That has worked pretty well for me in the past. It will basically give you a nice glow in the lighter areas of you footage.
Cheers,
Vince