From my observation, it is almost certain that it was taken at CFTE if one look at the:It was taken at CFTE supposedly...
The J-15A acting as chase plane is probably because that J-15A is one of the aircraft which happened to be testing at CFTE.
1. License plate of the BMW at the end of the video. The starting Chinese character rules out Chendu which should be 川 (Sichuan, Chengdu). The character is much blocky with more strokes, 陕 (Shaanxi, Yanlian) is more likely.
2. The face of the person in the local wedding party. Very typical northerner.
3. Clear blue sky in winter. Rare in Sichuan. Very common in north-west if there is no smog.
4. The house in the background has a typical roof top (one side slope) in Shaanxi, I have never seen it elsewhere in China.