They are really tiny and hard to focus on with a mobile camera. Are they good guys or bad guys? I don't think they are eating the leaves or the fruit, are they here for flower buds?
Those are aphids. Get your spray out and get rid of them quickly. I've had chilli plants and they're quite susceptible to these critters especially in dry climate and almost always after rainfall. Now you could either use a pesticide or buy a box of ladybugs or parasitic wasps and unleash them onto your plant. Also, it's best to get rid of them early on before they have a chance to multiply.