Here's a mixing sample in Reaper with HD Video Clips as it is Free to try n try n try..:
Download Multicam Videos here to practice with https://vimeo.com/110045836
Each track is a video dragged into Reaper from the Cam, the bottom track is your Biab audio track, music+vocals.
Download https://www.dropbox.com/s/wlxoqp2zg48b8ot/Reaper-Multicam-Mix.mp4?dl=1Click No Thanks Continue at the bottom to skip login
All you need is a few HD cameras placed at different angles.
If you only have one HD Cam just record it from a different angel each take or outside and inside.
You can use a phone with good quality video, but need to have it on a tripod, east west to fit a TV screen not north south like the narrow phone captures videos you see on the TV and they have to blend the sides of the video to fill in the blank sections each side of the video picture.
You just have your Biab song, with your vocals, playing on a cd or mp3 player (loud enough so the cameras pick up the audio for syncing later) that you sing along with in-sync while you are videoing the performance.
When done the tracks are lined up by syncing the audio on each video track with the finished Biab song audio track.
Now you can split, open up the tracks and add fades to allow the video underneath to play without moving the clips out of sync. Transparency is adjusted by dragging down the top of the clip to allow the clip below to blend in.
You then turn the volume right down on the audio in the video tracks so the audio is only from the Biab song track, then render to your finished video.
More here: Music Video Creation