Open Broadcast Software. It's open source and cross platform. Contain's plugin's too so you can customize other things as you like.
What is OBS?
Open Broadcaster Software is free and open source software for video
recording and live streaming. Supported features include:
Encoding using H264 (x264) and AAC. Support for Intel Quick Sync Video
(QSV) and NVENC. Unlimited number of scenes and sources. Live RTMP
streaming to Twitch, YouTube, DailyMotion, Hitbox and more. File
output to MP4 or FLV. GPU-based game capture for high performance game
streaming. DirectShow capture device support (webcams, capture cards,
etc). Windows 8 high speed monitor capture support. Bilinear or
lanczos3 resampling.