In the latest release of Windows Phone microsoft comes with video editing feature, that provides the ability to edit the videos from the app.
I used the dll(Windows.Media.Editing) for editing videos in the app. I take help from the channel 9 video for creating basic video trimming effect. You can found channel 9 video on this link http://channel9.msdn.com/Events/Build/2014/2-555.
I searched on google but not found any code related to video editing feature like overlay text on video, apply filters effect, slow motion video and lots more as said by microsoft.
Can anyone please share code, links for editing video for Windows Phone 8.1?
Try Windows.Media.Effects. I found this the other day, which documents adding slow motion effects to a MediaCapture object. It's on the Windows Store site but applies to Windows Phone 8.1. Sorry I have not tried this code out, but there's some example code on the page and it might lead you to other resources, like stabilisation and rotation.