How to gradually (fade effect) change a video clip from colour to black and white using keyframes.

Shotcut Beginners Tutorial: Quick And Easy Video Editing Using Proxy Clips.
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Shotcut: Quick And Easy Video Editing Tutorial For Beginners:-
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Shotcut is a free and open-source cross-platform video editing application for FreeBSD, Linux, OS X and Windows. Started in 2011 by Dan Dennedy, Shotcut is developed on the MLT Multimedia Framework, in development since 2004 by the same author.
Format
Format support through FFmpeg. Frame-accurate seeking for many formats. Supports popular image formats such as BMP, GIF, JPEG, PNG, SVG, TGA, TIFF as well as image sequences. Multi-format timeline: mix and match resolutions and frame rates within a project. Webcam and audio capture. Support for 4K resolutions. Network stream playback (HTTP, HLS, RTMP, RTSP, MMS, UDP). Frei0r video generator plugins (e.g. color bars and plasma). Color, noise, and counter generators. EDL (CMX3600 Edit Decision List) export. Export single frame as image or video as image sequence.
Audio
Audio scopes. Loudness. Peak meter. Waveform. Spectrum analyzer. Volume control. Audio filters and mixing. JACK transport sync. Tone generator. Stereo, mono, and 5.1 surround.
Video Effects
HTML5 as source and filters. Color grading tools. De-interlacing. Auto-rotate. Wipe transitions. Track compositing/blending modes. Speed and reverse effect for clips. Keyframes.
Hardware
Blackmagic Design SDI and HDMI for input and preview monitoring. Leap Motion for jog/shuttle control. Webcam capture. Audio capture to system audio card. Capture (record) SDI, HDMI, webcam (V4L2), JACK audio, PulseAudio, IP stream, and Windows DirectShow devices. Multi-core parallel image processing (when not using GPU and frame-dropping is disabled). DeckLink SDI keyer output. OpenGL GPU-based image processing with 16-bit floating point linear per color component.

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