Are you looking to Loop a Clip on the Timeline, or looking to Loop a DVD?
After burning dvd I should be able to play the dvd in dvd player and after the end of video playback it should restart the video again automatically
I am not sure what the option is exactly Loop a Clip on the Timeline, or Loop a DVD.
For an authored DVD, there is no capability to Loop that DVD, created in PrE. There are other authoring programs, like Sony's DVD Architect, and Adobe Encore (available only with PrPro), that allow this to be done easily.
The way to do similar in PrE is to do an AutoPlay DVD and then this use the Repeat button on the DVD player.