so this coin mining by GPU, just like ETH need video card to mining it ,right?
Bitcoin Gold is GPU mineable, just like Ethereum. Any equihash miner will be able to mine Bitcoin Gold, such as Claymore's ZCash miner
https://bitcointalk.org/index.php?topic=1670733.0 . You can do test mining at
http://btcg.miningspeed.com/ to see what sort of hashrate and BTG returns you'll get.
BTG Calculator,
https://www.crypto-coinz.net/crypto-calculator/