HTML5 with Web Services

Now the case, I want to develop a iPhone apps/web apps using Phonegap. Ok, imagine the app can do all sort of thing include data pro开发者_运维知识库cessing, transaction, login, video streaming, display data from the web services, so to do this I need use JavaScript (Ajax) to call the web services, then only put it into the HTML?

HTML5 now come with support of video right? For example, once I get the video data from the Web Services, then I use Javascript to insert into the video tag and HTML5 will handle it?

Yes on all counts.