one of my clients have so many video (of his football team, about 50GB or may be more) and want to host them.
He want to use this space only for video... So i think what he need is just a big storage space and bandwith.
Can you advise me and help me if that is possible and where can i find it ?
A Dreamhost account! They are fine for personal websites and blogs, but I don't think their oversold plans are really appropriate in this case. The OP needs to elaborate on his/her needs specifically with regards to bandwidth and the nature of the videos.
Dreamhost or someone like Goddady/1and1/Netfirms (but the only one i use and recommend is Dreamhost), but after 10/20gb we start to get on the vps/dedicated scale so don't expect too much from shared host, maybe use something like http://www.videoegg.com/ ? if the videos are yours, they will host it without problem, or any other of the thousand video sites ... hey google video... they will have the space/bandwidth combo for sure ^^