This 330uf 25v Low ESR Capacitor, made by Panasonic, is great for reducing the noise in your setups. Ideal on setups which have little on-board filtering (like a setup using a 4 in 1 ESC, but great on any setup), this Panasonic Capacitor will add a ton of filtering might to your setup. The result will be better video, less noise introduced to your Flight Controller, and a setup which overall operates better than a setup without a capacitor.
Solder the capacitor direct to your ESCs positive and negative leads. You will need one capacitor for each ESC. Ensure positive and negative are correct.