video - how to rotoscope a color mask in after Effects? -

i looking rotoscope person playing guitar person playing guitar 1 color , guitar color.

then, hoping color key both of 2 colors different textured background.

i'm struggling figure out how make work. suggestions?

so basic, tautological answer rotoscope it, means different things depending on footage:

if have arbitrary footage, i.e. jimmi hendrix archival footage, don't have lot of options work intelligently - since colors muted, quality low, , footage never shot rotoscoping in mind. footage, go frame frame, keyframing masks each.

if source video quality, can operations help, guitar, can try motion tracking need adapt mask when guitar tilts , changes shape. can same thing individual body parts limit work adapting masks on frame frame basis rather moving , adapting mask. breaking task few passes (head, torso, arms, legs) can go faster trying mask @ once, since changes 1 feature smaller overall change in pose.

if have opportunity shoot footage can save few weeks of work shooting intelligently. if want isolate guitar player , guitar, can covering guitar in blue painters tape , shooting against solid color background. way can chroma key + rough masking hand. elements of guitar key badly strings, add couple tracking points guitar can add rough mask covering strings/fretboard/whammy bar