To play video in UIWebView
use below code....
NSString *strVedio = @"<video controls> <source src=\"YourVideo.mp4\"> </video>";
NSString *path = [[NSBundle mainBundle] pathForResource:@"YourVideo" ofType:@"mp4"];
[Webview loadHTMLString:strVedio baseURL:[NSURL fileURLWithPath:path]];
UPDATE:
use this below code to display video in UIWebView
from video URL...
NSString *embedHTML = @"\
<html><head>\
<style type=\"text/css\">\
body {\
background-color: transparent;
color: white;
}\
</style>\
</head><body style=\"margin:0\">\
<embed id=\"yt\" src=\"%@\" type=\"application/x-shockwave-flash\" \
width=\"%0.0f\" height=\"%0.0f\"></embed>\
</body></html>";
NSString *strHtml = [NSString stringWithFormat:embedHTML, yourURLString, width,height];//set width and height which you want
[webView loadHTMLString:strHtml baseURL:nil];
[self.view addSubview:webView];
If you want to display in small screen only and without webview then use bellow code..
MPMoviePlayerController *videoPlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:url]];
[player setControlStyle:MPMovieControlStyleNone];
player.view.frame = CGRectMake(0, 0, 150, 150);
[self.view addSubview:videoPlayer.view];