Depends on the track, tire choice, suspension settings, ambient conditions and driver. All these variables factor into the ideal setting. The proper way to do it is to take measurements using a pyrometer and pressure gauge. If you're going for maximum tire life and optimal adhesion for your entire driving stint, you really do need to take the measurements.
Short of that if the outside of the tire is not wearing more quickly than the rest of the tire then your camber is sufficient. If the inside is wearing quicker than the rest of the tire you have too much camber. A good baseline to start would be -3 deg. You are going to need a camber gauge to figure out where that measurement is unless the camber plates have some type of delineation scribed onto them.
For the street around -1.5 to -2 deg is usually about right. Street driving style plays a big part in that though. I believe factory is about -1.2 (right?) so if you drive like a pussy-cat on the street then you’ll end up wearing out the insides first with too much camber.
The short answer is there is no ‘right’ answer for camber setting for street or track. Every car and every driver is slightly different. Even with all constants the same (car,driver, susp, tires, track) the variables like track and ambient temp can require camber adjustments.
I’m probably getting way too detailed for the occasional DE style setup. For most buyers it will be a set it and forget it setting for track and street driving. Even doing this will GREATLY improve your tire life on track. The ability to get way more precise is there though and it’s a fun challenge to master for those so inclined
