i have a website offering video service , my website is static html how can i add accepting btc to my website?
There are "payment buttons" for single item purchases. BitPay, WalletBit, Mt. Gox merchant tools, etc. all have them I believe.
What you could do then is set the response URL (after payment is made) to be the link for downloading the video (presuming that's what you meant by "video service").
Or you could just link the "buy now" button to the item's entry on CoinDL:
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https://www.coindl.com/page/category/videos