No. Oppo A3s does not have the Corning Gorilla Glass protection. Ideally, to protect the display, you should use tempered glass over it.
No. Oppo A3s does not have the fast charging support. However, the phone comes with 5V charger.
No. You can record maximum up to 1020p resolution videos with Oppo A3s.
No. Oppo A3s box packaging does not include earphone. You need to buy it separately.