In terms of image quality?
It kind of depends, more mega pixel dosnt always scale with better image quality, there are a lot f things that effect it like the size of the sensor, the phones processing of the image etc then when you add in streaming it depends on what kind of connection you have, and the speed.
You can cam with 5 mega pixel camera, as far as I know theres no minimum on sc that cameras need to be. For the quality assuming you have a good network connection and good speeds, if you take a photo with the camera of the phone (assuming selfie camera since you probably want to be able to see the screen) thats pretty much the image quality you can expect.