We often earn money from youtube channel by showing ads from adsense and suppose if someone want to earn bitcoin by showing ads on their youtube videos then is there any alternative ad network which provide ads for youtube channel?
Hm... No? Youtube adsense is owned by Google and they are paying with USD. If you want to earn Bitcoin with your Videos, I think you should find a new way like joining Video campaigns on Bitcointalk.
That's the right suggestion. If you're good in making videos get enrolled to the video creation campaign and earn through it. Else the only way is to get paid in terms of USD for your contents on YouTube channel and later convert it to bitcoin and hold it.
Its not just about the content related to earn money in Youtube channel. You need to have best videos which can give high number of views for a channel and videos on it.
You can that by monetizing your videos in the channel. Other than you can earn money in online via Google Adwords to make it with campaign.