Please recommend me a video editor. I am looking for a GUI application.
I haven't done any video editing recently so I do not know what the possibilities are.
Using a Linux only software is fine with me.
There is a pretty extensive number of applications which you could use to do this.
Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. It supports many file types, including AVI, DVD compatible MPEG files, MP4 and ASF, using a variety of codecs.
Video Editing program OpenShots Features include: * Support for many video, audio, and image formats (based on FFmpeg) * Gnome integration (drag and drop support) * Multiple tracks *, etc.
Kdenlive is a free and open-source video editor for GNU/Linux, FreeBSD and MacOsX.
VLMC (VideoLAN Movie Creator) is a free video editing software, offering features to realize semi-professional quality movies, but with the aim to stay simple and user-friendly.
Cinelerra is a highly advanced and professional video editing software, but still remains open source. Cinelerra solves three main tasks: capturing, editing and compositing.
Jahshaka (formerly known as CineFX) aims to become a cross-platform, open source, free, video editing software, effects, and compositing suite. It is currently in alpha stage, supporting realtime effects, etc.
LiVES is a Video Editing System. It is designed to be simple to use, yet powerful. It is small in size, yet it has many advanced features. LiVES mixes realtime video performance and non-linear editing in one window.
Kino is a non-linear DV editor for GNU/Linux. It allows you to record, create, edit, and play movies recorded with DV camcorders. This program uses many keyboard commands for fast navigating and editing inside.
Lumiera is NonLinear Video Editing (NLE) for GNU/Linux developed by the CinelerraCV community. It was born as a rewrite of the Cinelerra codebase called Cinelerra3 but it is now an independent project with its own repository and codebase.
Cinecutie is a Cinelerra mockup with some experiments (like utf8 fonts antialias and more).
Shotcut is a free, open source, cross-platform video editor.
Hybrid is a multi platform (Linux/Mac OS X/Windows) Qt based frontend for a bunch of other tools which can convert nearly every input to x264/Xvid/VP8 + ac3/ogg/mp3/aac/flac inside an mp4/m2ts/mkv/webm/mov/avi, etc.
You can use PiTiVi.
PiTiVi will let you to flexibly adjust the volume of parallel audio tracks (among many other typical tasks: splice, rejoin, add a new soundtrack, fade the soundtrack in and out, fade the image in and out, etc).
On top of doing what you need (unless I understood it wrong) it is quite easy to use and comes with most linux distros.
screenshot of GUI